Conclusion
The purpose of this paper is to consider whether the industrialization process in Vietnam’s
manufacturing industry after Doimoi is one of creative destruction. In order to check the
robustness of the decomposition results, we applied Olley–Pakes dynamic decomposition for
the aggregate TFP, estimated from WRDG, OP, LP and ACF. The results show that the
composition of the aggregate TFPs is correlated very high (over 80 percent) except net entry
components. Estimated results show that: first, the growth of aggregate productivity using
the WRDG method is found 2.323 percent. Second, the Olley–Pakes dynamic decomposition
shows that the contribution of private and the contribution of small and medium firms and
large firms to the TFP growth are positive and account for 133, 58.56 and 41.44 percent,
respectively. Third, job reallocation among the firms shows that the within-firm productivity
and net entry components are the main reason for TFP growth rather than reallocation.
Fourth, thus, the process of creative destruction take place in Vietnam’s manufacturing sector
is not due to the reallocation of employment between existing firms and the covariance
component, but the entry of more productive firms replacing inefficient firms and improve
productivity within the firms. This suggests that encouraging firms’ entry is important to
improve aggregate productivity. There are some policy implications suggested from the
research results: the establishment of a policy that fits into the competitive market, by
removing the barriers to entry and exit of firms, is necessary to help improve aggregate
productivity. Besides, the government should also encourage and support firms improving
productivity, especially for small and medium firms to improve aggregate productivity.
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eel industry, leading to substantial productivity growth for the industry as a whole.
Lan and Minh (2018) applied static and dynamic Olley–Pakes decomposition method to
examine the impact of technology spillover, reallocation of resources and competition to
the productivity of Vietnamese manufacturing enterprises in the period 2000–2015. They
show that the competitive effect in the reallocation process plays an important role in the
productivity growth of manufacturing sectors.
However, they do not directly correspond to a measure of job reallocation and
productivity growth of the economy in transition.
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1.2 Job creation, destruction and job reallocation
Job creation and job destruction are topics that have been written by many authors such as
Bilsen and Konings (1998), Davis and Haltiwanger (1992) and Bojnec et al. (1998). For example,
Bojnec et al. (1998) use a unique firm-level data based on traditional and newly established
private firms to investigate gross job flows and labor demand in a transition period in
Slovenia. They find that job destruction dominates job creation in the early years of transition,
but later in the transition job destruction diminishes. They also find that newly established
private firms are the most dynamic ones in terms of job creation. They estimate a reduced
labor demand equation controlling for ownership and competitive pressure and find that the
estimated employment elasticity with sales is rather low, 12 percent. Loecker and Konings
(2006) follow Olley and Pakes (OP) and Foster et al.’s (2001) decomposition method and find
the importance of entry and exit in job reallocation. They show that firm entry and exit are
important in the creative destruction process and TFP is increased mainly due to existing
firms’ increasing efficiency and through the net entry of firms. They also point out that state
firms should become more efficient when jobs are destroyed, while private firms are
characterized by the reallocation of employment to the more productive firms.
This study uses Wooldridge’s method to estimate TFP and follows the decomposition
method of Loecker and Konings (2006) to examine job reallocation across industries;
ownership as well as firm size in the Vietnamese manufacturing industry. We also compare
the results of dynamic decomposition from TFP estimated by different methods.
The next section provides the methodology for estimating firms’ total factor productivity
(TFP) as well as the procedure of static and dynamic decomposition of aggregate TFP. In
Section 3 we describe the data set and summarize the main results. The last section provides
the conclusion.
2. Methodology
2.1 The methods of estimating TFP
We start by assuming a Cobb–Douglas production function as follows:
Yit ¼ AitKbkit L
bl
it ;
where Yit denotes real value-added in firm i in period t, Lit the labor input, Kit the real capital
input and Ait the Hicksian neutral efficiency level of firm i in period t. Production function
after taking natural logs is as follows:
yit ¼ b0þbkkitþbl l itþeit ;
where yit denotes log real value-added in firm i at time t, l the log of labor, k the log of real
capital and:
ln Aitð Þ ¼ b0þeit ;
where β0 measures the mean efficiency level across firms and over time, εit is the time and
producer specific deviation, which can be decomposed into two components: an observable
component (or at least predictable) (vit) and unobservable component, a white noise error
term uqit
:
yit ¼ b0þbkkitþbl l itþvitþuqit ; (1)
where ωit¼ β0+vit represents firm-level productivity. In empirical studies, after estimating
(1), researchers solve for ωit. The estimated productivity can then be calculated as follows:
o^it ¼ v^itþ b^0 ¼ yitb^kkitb^l l it : (2)
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21,2
Productivity in levels can be obtained as exponential of o^it ; i.e., jit ¼ exp o^itð Þ. It has been
shown that estimation (1) uses OLS which leads to biased productivity estimates, caused by the
endogeneity of input choices and selection bias. Olley and Pakes (1996) developed a consistent
semi-parametric estimator. This estimator addresses the simultaneity problem by using a firm’s
investment decision to proxy for unobserved productivity shocks (it¼ω(iit, kit)). In OP
algorithms, it requires that investment is strictly increasing in productivity, this allows to
express unobservable productivity as a function of observable variablesωit¼ h(iit,kit)¼ i−1(iit, kit).
Because only observations with positive investment can be used when estimating (1), this can
lead to a significant loss in efficiency. So Levinsohn and Petrin (2003) (LP) use intermediate
inputs rather than investment as a proxy (mit¼ω(mit, kit)). LP’s estimation algorithm differs from
the algorithm introduced by OP in two important respects. First, they use intermediate inputs to
proxy for unobserved productivity, rather than investment. The second difference between the
approach using OP and LP is in the correction for selection bias.
Both OP and LP assume that there is at least one input that can be adjusted at no cost
and will react to the new information immediately. However, as Ackerberg et al. (2006)
(ACF) and Bond and Soderbom (2005) stated, for the labor coefficient to be identified in the
first stage of the estimation algorithm, it requires that there exists some variation in the
data, independent of investment (or intermediate inputs for LP).
The main difference between ACF’s approach and OP and LP is that, in ACF’s approach,
they inverse “conditional” rather than “unconditional” input demand functions to control for
unobserved productivity. This leads to results in a first stage that do not identify the
coefficients on labor input. Instead, all coefficients are estimated in the second stage.
Thus, all three semi-parametric-algorithms of OP, LP and ACF use the two-step
estimation procedure to obtain consistent estimates of input elasticity. Wooldridge (2009)
(WRDG) proposes to address the OP/LP problems by replacing the two-step estimation
procedure with a generalized method of moments (GMM).
We briefly discuss Wooldridge’s (2009) algorithm starting from the Cobb–Douglas
production function (1). In particular, he shows how to write the moment restrictions in
terms of two equations: these have the same dependent variable (yit) but are characterized
by a different set of instruments. This approach has useful features with respect to
previously proposed estimation routines:
(1) it overcomes the potential identification issue highlighted byACF in the first stage; and
(2) robust standard errors are easily obtained, accounting for both serial correlation
and/or heteroskedasticity.
The first step by OP/LP, the estimation of the parameters is addressed under the
assumption that:
E eitjl it ; kit ;mit ; l it1; kit1;mit1; . . .; l i1; ki1;mi1ð Þ ¼ 0: (3)
Without imposing any functional form on the control function ωit¼ h(kit, mit). The second
assumption exploits the Markovian nature of productivity. Following OP/LP, productivity
according to the first-order Markov process is as follows:
E witjl it ; kit ;mit ; l it1; kit1;mit1; . . .; l i1; ki1;mi1ð Þ ¼ E witjwit1ð Þ ¼ f h kit1;mit1ð Þð Þ: (4)
Assumptions (3) and (4) directly lead to the formulation of the following two equations:
yit ¼ b0þbl l itþbkkitþh kit ;mitð Þþvit ; (5)
yit ¼ b0þbl l itþbkkitþ f h kit1;mit1ð Þ½ þuit : (6)
175
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In the estimation the approach is to deal with the unknown functional form using nth-order
polynomials in kit and mit, where the limiting case with kit and mit (i.e. n¼ 1) entering
linearly should always be allowed.
The orthogonality condition on the error term (uit) is given by:
E uitjkit ; l it1; kit1;mit1; . . .; l i1; ki1;mi1ð Þ ¼ 0: (7)
To estimate βl and βk, Wooldridge (2009) assumed that h(kit,mit) contains all polynomials of
order 3 or less in the form:
h kit ;mitð Þ ¼ l0þc kit ;mitð Þl: (8)
Wooldridge (2009) also assume that f(.) can be approximated by a polynomial in h:
f hð Þ ¼ r0þr1hþ þrnhn: (9)
Equations (8) and (9) can be substituted into Equations (5) and (6) to give the following
equations:
yit ¼ aþbl l itþbkkitþcitlþeit t ¼ 1; 2; . . .::Tð Þ; (10)
and:
yit ¼ yþbl l itþbkkitþr1 cit1lð Þþ þrn cit1lð Þnþuit t ¼ 1; 2; . . .::Tð Þ; (11)
where α and θ are the new constant parameters obtained through the aggregation of all
constant terms, cit¼ c(kit, mit).
The GMM estimators are applied to estimate Equations (10) and (11). Once βl and βk are
obtained, the firm’s TFP can be computed by using Equation (2).
2.2 Static and dynamic decomposition
2.2.1 Static analysis: Olley–Pakes decomposition. Following OP, the aggregate TFP of
industry j at time t (Φjt) is calculated as a share-weighted average of firm productivity φijt:
Fjt ¼
X
i
Sijtjijt ; (12)
where sijt stands for a firm-specific weight of firm i in industry j at time t. Given our
interest in the process of job reallocation induced by productivity growth in
manufacturing, we compute an aggregate productivity index using job share, rather
than output-based market share:
Sijt ¼
LijtP
iLijt
; and SijtX0 and sum to 1:
To assess how the evolution of aggregate TFP depends on firm-level improvement in TFP
vs reallocation of employment between firms, this work follows the approach proposed by
Bartelsman et al. (2013) that is based on Olley and Pakes’ (1996) decomposition method. This
decomposition method splits the aggregate productivity index (Φt) into an unweighted
mean and a sample covariance term. Formally the index Φt is decomposed as:
Ft ¼ jtþ
X
i
sitstð Þ jitjt
¼ jtþcovOPt ; (13)
where jt represent unweighted mean productivity:j ¼ 1=Nt
P
i
jit .
176
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21,2
The second term on the right-hand side of (13) covOPt
is known as the Olley–Pakes
covariance. The covariance changes over time as resources are reallocated across the
existing firms.
The same decomposition of the aggregate TFP in Equation (13) could be broken down by
some different categories ν (by ownership or by size or by industry):
Ft uð Þ ¼ jt uð Þþ
X
i
sit uð Þst uð Þð Þ jit uð Þjt uð Þ
¼ jt uð ÞþcovOPt uð Þ: (14)
These decompositions will help us to understand whether the average productivity of light
industry (L) and heavy industry (H) (or small and medium-sized (SM) firms with large-scale
firms (LA), or private owned (PR) and state-owned (ST) firms) evolved differently.
From where the within-industry decomposition can be defined as:
Ft ¼
X
uASET
st uð Þ jt uð ÞþcovOPt uð Þ
: (15)
where SET denotes sets of H, L or SM, LA or PR, ST. This decomposition reflects both the
actual component change, the un-weighted average and the covariance term, as well as the
job share of the particular type.
2.2.2 Decomposition between categories following Collard-Wexler and Loecker (2015). In
order to measure the importance of reallocation of resources among the categories
mentioned above, we apply the same type of decomposition, but now the unit of observation
is a category (heavy or light industry, small and medium or large firms, private or
state-owned firms). This allows us to isolate the between– type reallocation component in
aggregate productivity:
Ft ¼ Ftþ
X
uASET
st uð Þ12
Ft uð ÞFt
¼ FtþcovBt ; (16)
where covBt is the “Between covariance” measuring the level of resource reallocation to
categories, contributed to the aggregate productivity for the entire industry.
2.2.3 Dynamic decomposition. The above decomposition shows only a static version that
may not reflect the dynamic impact of firms’ entry or exit on aggregate productivity. The
dynamic decomposition method considers four distinct sets of producers in a given time
window t−1 and t, where t is a one year window. More specifically, dynamic productivity
decomposition examines the origin of productivity changes by three types of firms:
survivors (S), entrants (E) and exiters (X). An entering firm in the industry is defined as a
firm whose market share has increased from 0 and an exiting firm is defined as a firm with a
market share of zero in each time window. Aggregate productivity growth can be
decomposed as follows:
DFt ¼
X
iAS
sitjitsit1jit
þX
iAS
sitjit
X
iAS
sitjit1
¼
X
iAS
sitjitsit1jit1
þX
iAS
sitjit1sit1jit1
þX
iAS
sitjit1sit1jit1
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Productivity
growth and job
reallocation
þ
X
iAS
sit1jitsit1jit
þX
iAE
sitjit
X
iAX
sit1jit1
¼
X
Plant Improvement
iA S
sit1Djit
0
B@
1
CAþ X
Reallocation
iA S
jit1Dsit
0
B@
1
CA
þ
X
Covariance
iA E
Dsit1Djit
0
B@
1
CAþ X
Entry
iA E
sitjit
X
Exit
iA X
sit1jit1
0
B@
1
CA: (17)
In (17), the first term is the sum of changes in productivity with the share of labor at time
t−1, which is referred to as a pure within-firm productivity increase or simply firm
improvement; the second term is the sum of change in labor share multiplied by
productivity at time t−1 and is referred to as the reallocation component (reallocation); the
third term is the sum of the product changes in labor share and productivity and is referred
to an interaction term or the covariance component and the last term is a net entry
component (net entry).
We further split up every component in the decomposition represented in Equation (17)
according to ownership (private and state owned), industry (heavy and light industries) and
size (small and medium firms and large firms).
3. Empirical research results
3.1 Data and basic patterns of gross job flows
3.1.1 Data. The data used in this study are obtained from the set of GSO annual
survey data for firms from 2000 to 2016. We exclude observations that have not positive
or lost value such as property, revenue and labor. Information is available on 535,165
firms from 2000 to 2016. Variables in value are expressed in units of Vietnam dong
and deflated. In this study, value added (VA) is used to estimate TFP at the firm level.
Data on VA are not available and are measured based on the income approach.
Information on income compensation, fixed asset depreciation and profitability is
available in the enterprise survey. Appendix 2 shows descriptive statistics on average,
maximum and minimum values of capital, labor, value added, revenue and profit of the
manufacturing industry.
3.1.2 Basic patterns of gross flows. We measure gross job flows as defined by Davis and
Haltiwanger (1992). Job creation rate (pos) is the sum of all job gains at expanding and new
establishments within a sector that is divided by the sector size. In the same way, we also
define job destruction (neg) as the sum of all job losses at shrinking and dying
establishments within a sector that is divided by the sector size.
We determine that the sum of the two gives a measure for gross job reallocation
(gross) and the difference between them generating net employment growth (net). If we
take the difference between the ratio of gross job allocation and the absolute value
of net employment growth, we will get a measure of excess job reallocation (excess).
Such a measure tells us how much volatile job is taking place after having accounted for
the job reallocation that is needed to meet certain aggregate job growth rates.
This measure can be considered a better measure of the real churning that is happening in
the labor market.
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21,2
We define two other measures that represent the role of entry and exit in the sum of all
job gains and the sum of all job losses. The first measure is the average of the entry over the
sum of all job gains (Entry/Pos) and the second measure is the average of the exit over the
sum of all job losses (Exit/Neg) for the year, respectively. The share of total entry and exit in
job reallocation can be defined as (Entry+Exit)/Gross.
In the post-Doimoi period, the policies of equitization and enterprise law took effect, the
economy had many changes especially many old jobs have been no longer appropriate
and destructed, and many new jobs were created. Table II shows that on average the job
creation rate (pos) and job destruction rate (neg) during 2000–2016 in the Vietnamese
manufacturing sector are 20.42 and 12.06 percent, respectively. Thus, the job creation rate
dominates the job destruction rate. This conclusion contradicts the conclusion of Loecker
and Konings (2006). However, our conclusion is reasonable because Vietnam’s
manufacturing sector accounts for a very small proportion and labor of the industry
sector only accounts for about 10 percent of the population before the Doimoi period. From
Doimoi period, many policies have been implemented, leading many old jobs canceled
while the number of new jobs created by many private firms established and growing
rapidly. Table I indicates the evolution of gross job flow over time and the annual average
of the gross job reallocation is 32.48 percent during 2000–2016. Excess job reallocation
fluctuates around the average value of 23.52 percent, indicating the ability to create and
destroy high jobs simultaneously.
The last three rows in Table I show that on average 41.77 percent of all job creation is
accounted for by firms’ entry and 34.13 percent of all job destruction is accounted for by
firms’ exit. The combined contribution of entry and exit of firms in the Vietnamese
manufacturing sector during the period in job reallocation is 38.94 percent.
In Table II, we slice the data into different subsets (by ownership, by industry and by
size) that are most affected by Vietnamese government policies during the Doimoi
period to highlight the heterogeneity of firms in terms of gross job flows. Specifically,
in each subset, we divide it into two opposing sets: private and state-owned firms
(second column), heavy and light industries (third column), SMEs and large firms
(fourth column).
We find that job creation is concentrated in private firms with job creation rates in
state-owned firms averaging only 7.78 percent, much lower than the private firms
22.47 percent. However, the rate of job destruction of state-owned firms and private firms is
almost the same (12.48 vs 11.77 percent). So in this period, the state-owned firms have been
Contents 2000–2001 2007–2008 2008–2009 2014–2015 2015–2016
Average
2000–2016
Number of entry firms 3,539 11,717 12,811 20,861 18,757 10,987
Number of exits firms 2,013 5,539 8,462 11,285 13,633 7,539
Job creation (Pos) 11.97 19.65 18.38 16.95 18.68 20.42
Job destruction (Neg) 16.72 13.26 14.72 11.17 15.00 12.06
Net employment growth rate (Net) −4.75 6.40 3.66 5.79 3.69 8.36
Gross job reallocation (Gross) 28.70 32.91 33.11 28.12 33.68 32.48
Excess job reallocation (Excess) 23.95 26.51 29.44 22.34 29.99 23.52
Entry 1.68 10.33 8.51 5.76 8.08 8.53
Exit 11.12 2.74 3.41 3.38 6.89 4.12
Share of entry in job creation 41.77
Share of exit in job destruction 34.13
Share of entry and exit in job reallocation 38.94
Source: Calculated from GSO data
Table I.
Aggregate job
flows (%)
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Productivity
growth and job
reallocation
downsizing substantially because of the renovation and equitization. This shows that
private-owned firms are net job creators, while state-owned firms are net job destroyers.
Thus, the Doimoi policy has motivated the private sector to develop more dynamically than
the state economic sector.
The last three lines of the upper and lower parts of Table II show that the contribution to
the job destruction explained by the firm exit is 32.91 percent in the private sector while only
19.14 percent in the state-owned firms. This reflects the fact that the government still
subsidizes state-owned firms (such as Thai Nguyen iron and steel plant with heavy losses
has been invested). This also reflects the impact of equitization policy as well as the business
laws enacted in the Doimoi period, and the market forces in the private sector outperform
the state sector. So if new firms are more efficient they could push out old and inefficient
firms; we expect the important role of entry and exit in the private sector where the
restructuring process seems to be taking place and replacing unproductive state-owned
firms with more productive private firms.
The estimated indicators of job creation, job destruction, the rate of job reallocation as
well as employment growth are presented in Table II. We can draw some conclusions:
(1) The average job creation rates in heavy and light industries[1] are almost the same
(23.51 and 20.38 percent); meanwhile, these rates are much different for large firms
and small and medium firms (16.37 and 26.57 percent).
(2) The average job destruction rates in heavy and light industries are almost the same
(13.49 and 10.88 percent); meanwhile, these rates are much different for large firms
and small and medium firms (9.12 and 16.38 percent). That respects the fact that the
state still subsidy for large firms even though they are inefficient and on the other
hand many private firms grow rapidly (Hoa Phat Steel, for example).
By ownership By industry By size
Contents State-owned
firms
Heavy manufacturing
firms
Large firms
Pos 7.78 23.51 16.37
Neg 12.48 13.49 9.12
Net −4.70 10.02 7.25
Gross 20.26 37.00 25.49
Excess 14.22 26.71 17.66
Entry 0.00 11.32 6.56
Exit 2.39 5.07 2.49
Share of entry in job creation 0.00 48.15 40.04
Share of exit in job destruction 19.14 37.56 27.26
Share of entry and exit in job reallocation 11.79 44.29 35.47
Contents Private-owned
firms
Light manufacturing
firms
Small and medium
firms
Pos 22.47 20.38 26.57
Neg 11.77 10.88 16.38
Net 10.71 9.50 10.19
Gross 34.24 31.25 42.95
Excess 23.28 21.67 32.06
Entry 9.51 8.12 11.51
Exit 3.87 3.24 6.60
Share of entry in job creation 42.34 39.85 43.32
Share of exit in job destruction 32.91 29.76 40.31
Share of entry and exit in job reallocation 39.10 36.34 42.17
Source: Calculated from GSO data
Table II.
Aggregate job flows
by ownership, by
industry and by
category (%)
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21,2
(3) The average gross job flows in heavy and light industries are 37.0 and 31.25 percent.
These ratios, as shown in Table II, show an inverse relationship between gross job
flows and firm size, which is a common pattern for market economies.
(4) In the heavy and light industrial firms as well as the large firms and small and
medium firms, the contribution to job creation by firm entry is almost more than
40 percent. This can be explained by the fact that although the state-owned
economic sector has narrowed, the private sector has grown rapidly in both heavy
industry and light industry. And not only many small firms are formed but also
private firms are growing rapidly.
3.2 Results of decompositions
We rely on the estimated productivity by the WRDG’s method to show the importance of
reallocation, both cross and within categories (private vs state-owned firms, heavy vs light
industry, large vs small and medium firms) in productivity growth that makes us to
investigate the importance of entry and exit in productivity growth.
3.2.1 Static decomposition of productivity growth. Table III provides the results of
aggregate TFP decomposition into components to consider their role in aggregate TFP
changes from 2000 to 2016.
Table I shows that the gross job reallocation is 26.27 percent during the period. Thus, the
reallocation of employment has contributed an important part in the productivity growth
of manufacturing. This indicates that the impact of the Vietnamese government’s
post-renovation policies has helped the market mechanism work well and through which
reallocation of resources has helped firms improve productivity.
The results of the within decomposition at Table III show that the aggregate TFP of
private and the state-owned firms, heavy and light industry, large and small and medium
firms has changed to 3.093, −0.796, 0.315, 1.030, 0.936 and 1.361, respectively. In which,
reallocation resources of the above-mentioned industries contributed 30.13, 11.18, 49.21,
37.77 and 21.28 percent, 29.02 percent among aggregate TFP growth, respectively. Thus, the
reallocation of labor forces is toward the most productive firms. This reflects the fact that it
Job allocation Job allocation Job allocation
Aggregate TFP 2.323 2.323 2.323 2.323
Olley_Parkes
Decomposition 2.323 2.323 2.323 2.323
Unweighted average 1.293 1.293 1.293 1.293
Covariance 1.031 1.031 1.031 1.031
Between decomposition 2.323 2.323 2.323 2.323
Unweighted average 2.354 2.354 2.743 2.299
Between Covariance −0.030 2.271 −0.420 0.025
Within decomposition 2.323 2.323 2.323 2.323
Light
industry
Heavy
industry
State
owned
Private
owned
Small and
medium
Large
firms
Aggregate TFP 1.030 0.315 −0.769 3.093 1.361 0.963
Unweighted average 0.640 0.161 −0.684 2.160 0.966 0.758
Within Covariance 0.389 0.155 −0.086 0.932 0.395 0.205
Notes: The aggregate TFP of manufacturing firms increased by 2.323 percent during the study period.
Olley–Pakes static decomposition shows that this increase is due to the contribution of the firm becoming more
productive (56 percent) and the job reallocation from unproductive firms to more productive firms (44 percent)
Source: Estimated from GSO data
Table III.
Static decompositions
of productivity
growth change
2000–2016 (%)
181
Productivity
growth and job
reallocation
is happening in the manufacturing sector of Vietnam after innovation (the share of total
entry and exit in gross of heavy manufacturing firms is the highest (49.9 percent)).
3.2.2 Dynamic decomposition of productivity growth. Table IV presents the results
of dynamic decomposition. Its columns show the results of TFP decomposition
into components. Its rows report the results in one-year window decomposition for the
entire sample.
Aggregate productivity rose by 2.323 percent over the entire period while the internal
firm improvement component accounted for 4.633 percent, lower than the results for the US
steel industry by Collard-Wexler and Loecker (2015). The change in TFP is less than firm
improvement because of the contribution of the reallocation component and the covariance
component is negative. Improvements within the enterprise are positive across all time
windows except for the first two windows. This result demonstrates that most of
the productivity growth is explained by the internal improvement component. Thus, the
restructuring of firms in the Vietnamese manufacturing industry, reflected in the aggregate
job creation and job destruction process, seems to have resulted in substantial within-firm
productivity growth and entry components.
Meanwhile, the reallocation components which are negative in most time windows
(except for the years 2000–2001, 2008–2009 and 2011–2012) indicate that the within-firm
productivity growth is the main component for TFP growth. This result is consistent with
the findings of Loecker and Konings (2006) for Slovenian manufacturing. In addition, the
negative components between firms for most time windows suggest that growth in
productivity has been associated with a process in which more productive firms are
downsizing faster than less productive firms. The estimated results of productivity
growth, productivity improvement and reallocation components for the years 2008–2009,
2011–2012 suggest that positive productivity growth of manufacturing is due to
firm-improvement and the reallocation of resources from unproductive firms to more
productive firms.
The covariance term tells us how the level of productivity change is correlated with
changes in employment. This component is negative in all time windows, which shows that
firms that increase in terms of productivity become smaller in size. This conclusion holds
Period Total change Firm improvement Reallocation Covariance Net entry Entry Exit
2000–2001 −0.051 −0.043 −0.147 −0.170 0.308 0.640 0.332
2001–2002 −0.413 −0.168 0.030 −0.274 0.000 0.334 0.334
2002–2003 0.031 0.191 −0.107 −0.132 0.079 0.298 0.220
2003–2004 0.017 0.091 −0.134 −0.081 0.141 0.346 0.205
2004–2005 −0.074 0.005 −0.021 −0.069 0.012 0.232 0.220
2005–2006 0.223 0.275 −0.051 −0.094 0.093 0.339 0.246
2006–2007 0.343 0.398 −0.190 −0.138 0.273 0.452 0.180
2007–2008 0.073 0.403 −0.113 −0.325 0.108 0.366 0.258
2008–2009 0.589 0.641 0.089 −0.297 0.156 0.476 0.319
2009–2010 −0.092 0.144 −0.064 −0.143 −0.029 0.319 0.348
2010–2011 0.090 0.088 −0.031 −0.167 0.200 0.542 0.343
2011–2012 0.420 0.498 0.090 −0.157 −0.011 0.304 0.315
2012–2013 0.062 0.052 −0.054 −0.081 0.145 0.510 0.365
2013–2014 0.133 0.720 −0.114 −0.545 0.073 0.478 0.404
2014–2015 0.664 0.765 −0.099 −0.222 0.220 0.514 0.295
2015–2016 0.308 0.572 −0.252 −0.196 0.185 0.563 0.379
Total 2.323 4.633 −1.170 −3.092 1.952 6.714 4.762
Source: Estimated from GSO data
Table IV.
Dynamic
decomposition of
productivity
growth (%)
182
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21,2
true for all transitional economies, especially the post-socialist economy, as is the case with
Loecker and Konings (2006).
More importantly, however, the net firm entry component explains 1.952 percent of the
observed aggregate productivity growth over the sample period, while the industry
aggregate productivity growth is 2.323 percent in the same period during the period.
The decomposition results show that the contribution to aggregate TFP growth of the
firm improvement component clearly dominates the net entry component as it is over two
times the magnitude on average (4.633 vs 1.952 percent). However, for a number of years
such as 2001–2005, 2010–2011 and 2012–2013, the contribution of net entry to aggregate
productivity growth dominates the contribution of firm improvement. The creative
destruction process taking place in Vietnam’s manufacturing sector is not due to the
reallocation of employment between existing firms and the covariance component, but
the entry of more productive firms replacing inefficient firms and improving productivity
within the firms. This suggests that encouraging firms’ entry is important to improve
aggregate productivity.
Table V presents a summary of the results of this decomposition broken down by
categories (more details in Appendix 3). Total change in TFP of all subsets shows positive
productivity growth except state-owned firms (−0.769 percent). Thus, the contribution of
private-owned and state-owned firms to its productivity growth is 133 and −33 percent,
respectively. Similarly, the contribution of small and medium enterprises and large
enterprises is 58.56 and 41.44 percent, respectively.
We can note that the growth of aggregate TFP reported in Table V is mainly due to firm
improvement component and net entry component, except the case of state-owned firms
(since the net entry of state-owned firms is negative). In other words, in general, firms have
become more efficient in accordance with the above analysis. So after Doimoi, the
restructuring of firms, reflected in the process of aggregate job creation and job destruction,
seems to have resulted in an improvement in the efficiency within firms, making firms more
productive. For example, the contributions of firm improvement component for the light
industry, heavy industry and other industries are 2.755, 0.653 and 1.224 percent,
respectively. On the other hand, the reallocation component of almost all categories (except
for small and medium firms) in Column 4 is negative. These two results give the conclusion
that growth in productivity has been associated with a process in which more productive
firms are downsizing faster than less productive firms in most categories. This conclusion is
consistent with the conclusion when we decompose TFP for the entire manufacturing
industry above.
The negative covariance component for all categories in Column 5 suggests that firms
increasing productivity in all categories become smaller in size.
Period
Total
change
Firm
improvement Reallocation Covariance
Net
entry Entry Exit
State–owned firms −0.769 0.397 −0.740 −0.357 −0.069 0.866 0.936
Private firms 3.093 4.236 −0.430 −2.734 2.021 5.848 3.826
Light industry 1.030 2.755 −0.809 −1.738 0.822 3.247 2.425
Heavy industry 0.315 0.653 −0.398 −0.471 0.531 1.813 1.282
Other industry 0.979 1.224 0.038 −0.882 0.599 1.654 1.056
Small and medium
firms 1.361 1.748 0.338 −1.640 0.914 3.587 2.673
Large firms 0.963 2.884 −1.507 −1.452 1.038 3.127 2.089
Source: Estimated from GSO data
Table V.
Dynamic
decomposition of
productivity growth
by category (%)
183
Productivity
growth and job
reallocation
Comparing the net entry and the firm improvement component, we find that the
contribution of the net entry components of heavy manufacturing firms to their productivity
growth is higher than the contribution of the firm improvement component. This shows that
the creative destruction process in large firms is not caused by reallocation of employment
among existing firms, but rather by the entry of more productive firms replacing
unproductive firms. A typical example is that Hoa Phat Steel firm is a private firm newly
established after Doimoi, but now it is dominating and becoming the largest steel job share
in Vietnam.
This suggests that encouraging firm entry or exit in the Vietnamese manufacturing
industry is important for aggregate productivity growth. Therefore, policies fitting into the
competitive market, by removing the barriers to entry and exit of firms, are necessary to
help improve aggregate productivity.
3.2.3 Sensitive analysis. To consider whether TFPs that are estimated from four different
methods (WRDG, LO, OP and ACF) have different conclusions when using the same Olley–
Pakes dynamic decomposition, we calculated the Spearman rank correlation to see the
correlation between the total changes in aggregate TFP estimated from four methods
(WRDG, LP, OP and ACF). The results are reported in Tables VI and VII.
The first part of Table VI presents the correlation between the total change in the
aggregate TFP, and the second part of this table presents the correlation between the firm
improvement components. It is clear that the changes in aggregate TFP estimated from
different methods and the firm improvement components are very highly correlated (always
higher than 0.80). Correlations between the total changes in TFP estimated fromWRDG and
from LP, OP are also typically higher than 0.95.
Part 1 of Table VII presents the correlation between the reallocation components and
Part 2 is showing the correlation between the net entry components. The results in Part 1 of
Table VII give the same conclusion as drawn from Table VI, but the results in Part 2 of
Table VII are slightly different.
Total change Firm improvement components
WRDG LP OP ACF WRDG LP OP ACF
WRDG 1.000 1.000
LP 0.9824* 1.000 0.9794* 1.000
OP 0.9618* 0.9912* 1.000 0.9794* 1.000* 1.000
ACF 0.8912* 0.8824* 0.8647* 1.000 0.8294* 0.8059* 0.8059* 1.000
Notes: PW matrix (obs¼ 16). *Statistical significance at 5 percent
Source: Estimated from GSO data
Table VI.
Spearman rank
correlation of total
change components
(or of firm
improvement
components)
Reallocation components Entry components
WRDG LP OP ACF WRDG LP OP ACF
WRDG 1.000 1.000
LP 0.9941* 1.000 0.7971* 1.000
OP 0.9794* 0.9853* 1.000 0.9412* 0.8676* 1.000
ACF 0.8974* 0.8959* 0.8886* 1.000 0.7290* 0.5714* 0.7099* 1.000
Notes: PW matrix (obs¼ 16). *Statistical significance at 5 percent
Source: Estimated from GSO data
Table VII.
Spearman rank
correlation of
reallocation
components (or of
entry components)
184
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21,2
4. Conclusion
The purpose of this paper is to consider whether the industrialization process in Vietnam’s
manufacturing industry after Doimoi is one of creative destruction. In order to check the
robustness of the decomposition results, we applied Olley–Pakes dynamic decomposition for
the aggregate TFP, estimated from WRDG, OP, LP and ACF. The results show that the
composition of the aggregate TFPs is correlated very high (over 80 percent) except net entry
components. Estimated results show that: first, the growth of aggregate productivity using
the WRDG method is found 2.323 percent. Second, the Olley–Pakes dynamic decomposition
shows that the contribution of private and the contribution of small and medium firms and
large firms to the TFP growth are positive and account for 133, 58.56 and 41.44 percent,
respectively. Third, job reallocation among the firms shows that the within-firm productivity
and net entry components are the main reason for TFP growth rather than reallocation.
Fourth, thus, the process of creative destruction take place in Vietnam’s manufacturing sector
is not due to the reallocation of employment between existing firms and the covariance
component, but the entry of more productive firms replacing inefficient firms and improve
productivity within the firms. This suggests that encouraging firms’ entry is important to
improve aggregate productivity. There are some policy implications suggested from the
research results: the establishment of a policy that fits into the competitive market, by
removing the barriers to entry and exit of firms, is necessary to help improve aggregate
productivity. Besides, the government should also encourage and support firms improving
productivity, especially for small and medium firms to improve aggregate productivity.
Note
1. According to German et al. (2011), we divide industrial into broad categories of sector: light
industry, heavy industry and other. A light industry consists of food products and beverages,
tobacco products, textiles, wearing apparel, dressing and dyeing of fur, tanning and leather
products, furniture, etc. Heavy manufacturing comprises coke, refined petroleum and nuclear fuel,
chemicals and chemical products, rubber and plastic products, other non-metallic mineral
products, basic metals, fabricated metal products.
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Appendix 1
Prior to the Doimoi, heavy industry was considered as a foundation and a priority for development. In
this period, the majority of foreign investment and aid were concentrated on building large-scale plants
(the investment capital for heavy industry increased more than 12 times while investment for light
industry increased about 7 times) while the resources are limited, the economy is difficult, thought
rushed heavy industry does not serve timely agriculture and light industry should lead to crisis, lose
weight serious structure.
After the renovation, the policy of industrialization has changed significantly since the development
of heavy industry has gradually shifted to the direction of heavy industry development with the degree
of power and agriculture and the consumer goods industry. In the period of 1987–1996, the economy
gradually improved, quality and gradually escaped from the crisis. In the period of 1997–2006,
agriculture and processing industry were considered as the breakthroughs and priorities of Vietnam.
Therefore, from 2007 to now, Vietnam’s industrial policy has shifted to encourage the development of
high-tech, complementary software technology to gradually develop the economy in depth.
Before renovation After renovation
Period Period 1960–1986 Period 1987–1996 Period 1997–2006 Period 2007–now
Industrialization
policy
To prioritize the
development of
heavy industry on
the basis of
developing
agriculture and light
industry
Agriculture is the
leading front,
developing heavy
industry with level,
power. Take
agriculture, consumer
goods industry and
export as the focus
To accelerate the
industrialization and
modernization of
agriculture, to make
breakthroughs in
combination with the
processing industry
To encourage the
development of
high technologies,
processing
industries, software
technology and
subsidiary
technologies.
Prioritize Heavy industry Light industry Light industry High technology,
processing industry
Note: Vietnam’s industrialization policy has changed considerably before and after the renovation
Table AI.
Vietnam
industrialization
policy before and
after Doimoi
186
JED
21,2
Appendix 2
The relative size of light and heavy industries dropped steadily over the period. By 2016, light and
heavy industry accounted for 32.0 and 34.9 percent of the total capital employed in the manufacturing
sector, respectively. The light industry remains the most labor-intensive sector, employing 61.6 percent
of the total labor vs 17.2 percent for heavy industry are reported in Table AIV.
Variables
Manufacturing industry
2000–2016
Light manufacturing
2000–2016
Heavy manufacturing
(2000–2016)
Capital (K)
Mean 12,583.62 11,577.38 13,208.75
SD 137,997.30 77,804.89 130,393
Skewness 115.83 30.56572 88.51467
Labor (L)
Mean 114 177 63
SD 664 935 190
Skewness 48 36 13
Value added (VA)
Mean 2,750.14 3,059.499 2,169.043
SD 45,819.22 25,120.77 16,484.12
Skewness 200.24 51.65395 39.67112
Revenue
Mean 17,537.06 17,325.57 14,835.99
SD 356,862.20 122,137.3 176,914.2
Skewness 217.70 42.96253 135.3425
Profit
Mean 902.73 760.2117 719.2143
SD 34,459.93 14,936.26 9,864.679
Skewness 227.07 74.9064 60.13158
Observations 535,165 214,894 178,873
Source: Calculated from GSO data
Table AII.
Description statistics
187
Productivity
growth and job
reallocation
Appendix 3
Light industry
Total
change
Firm
improvement Reallocation Covariance
Net
entry Entry Exit
2000–2001 −0.185 −0.175 −0.448 −0.342 0.779 1.589 0.810
2001–2002 −0.990 −0.355 −0.100 −0.499 −0.037 0.815 0.852
2002–2003 0.108 0.530 −0.346 −0.254 0.179 0.711 0.532
2003–2004 0.065 0.253 −0.392 −0.138 0.342 0.834 0.491
2004–2005 −0.249 −0.049 −0.067 −0.102 −0.031 0.531 0.562
2005–2006 0.672 0.772 −0.152 −0.174 0.227 0.856 0.629
2006–2007 0.963 1.099 −0.594 −0.261 0.719 1.145 0.426
2007–2008 0.090 0.851 −0.333 −0.658 0.230 0.851 0.621
2008–2009 1.764 1.929 0.145 −0.643 0.333 1.173 0.840
2009–2010 −0.298 0.347 −0.190 −0.310 −0.145 0.745 0.891
2010–2011 0.369 0.210 −0.054 −0.269 0.482 1.304 0.822
2011–2012 1.121 1.229 0.247 −0.286 −0.068 0.688 0.756
2012–2013 0.747 0.496 −0.137 −0.004 0.392 1.245 0.854
2013–2014 0.408 1.945 −0.402 −1.502 0.366 1.344 0.977
2014–2015 2.183 2.184 −0.210 −0.360 0.569 1.312 0.742
2015–2016 0.978 1.761 −0.871 −0.408 0.496 1.438 0.942
Total 7.743 13.027 −3.905 −6.211 4.833 16.580 11.747
Light industry 3.176 7.342 −2.730 −3.326 1.890 7.954 6.063
Heavy industry 0.829 1.746 −1.296 −0.869 1.248 4.369 3.121
Other industry 3.738 3.939 0.120 −2.016 1.695 4.258 2.563
State-owned firms −2.005 1.160 −2.261 −0.659 −0.245 2.389 2.634
Private firms 9.748 11.867 −1.644 −5.552 5.078 14.191 9.114
Small and medium firms 3.582 4.103 0.530 −2.970 1.919 7.693 5.774
Large firms 4.162 8.923 −4.435 −3.241 2.914 8.888 5.973
Note: TFP is estimated by OP method
Table AIII.
Dynamic
decompositions of
productivity growth
change 2000–2016
(percent)
188
JED
21,2
Light industry Total change Firm improvement Reallocation Covariance Net entry Entry
2000–2001 −0.122 −0.111 −0.309 −0.276 0.574 1.177
2001–2002 −0.744 −0.277 −0.024 −0.422 −0.021 0.606
2002–2003 0.070 0.377 −0.235 −0.208 0.136 0.534
2003–2004 0.042 0.180 −0.274 −0.120 0.255 0.623
2004–2005 −0.169 −0.021 −0.045 −0.095 −0.008 0.404
2005–2006 0.466 0.547 −0.105 −0.145 0.169 0.630
2006–2007 0.686 0.787 −0.407 −0.215 0.522 0.842
2007–2008 0.090 0.678 −0.232 −0.535 0.179 0.644
2008–2009 1.229 1.342 0.132 −0.506 0.261 0.870
2009–2010 −0.203 0.262 −0.133 −0.243 −0.089 0.564
2010–2011 0.224 0.154 −0.046 −0.242 0.357 0.973
2011–2012 0.807 0.912 0.176 −0.241 −0.040 0.525
2012–2013 0.385 0.263 −0.103 −0.059 0.283 0.927
2013–2014 0.286 1.436 −0.264 −1.106 0.220 0.950
2014–2015 1.471 1.540 −0.165 −0.321 0.417 0.964
2015–2016 0.663 1.208 −0.576 −0.324 0.354 1.052
Total 5.179 9.278 −2.611 −5.057 3.569 12.286
Light industry 2.179 5.310 −1.814 −2.747 1.430 5.902
Heavy industry 0.606 1.270 −0.882 −0.726 0.944 3.276
Other industry 2.395 2.697 0.086 −1.584 1.196 3.108
State-owned firms −1.412 0.247 −1.417 −0.086 −0.155 1.487
Private firms 6.555 8.943 −1.141 −4.971 3.725 10.798
Small and medium firms 2.605 3.109 0.481 −2.490 1.504 5.995
Large firms 2.575 6.168 −3.091 −2.568 2.065 6.291
Note: TFP is estimated by LP method
Table AIV.
Dynamic
decompositions of
productivity growth
change 2000 no 2016
(percent)
189
Productivity
growth and job
reallocation
Corresponding author
Phung Mai Lan can be contacted at: lanpm@tlu.edu.vn
Period
Total
change
Firm
improvement Reallocation Covariance
Net
entry Entry Exit
2000–2001 0.001 0.012 −0.091 −0.033 0.113 0.277 0.164
2001–2002 −0.117 −0.049 −0.037 −0.046 0.016 0.175 0.159
2002–2003 0.038 0.071 −0.065 −0.027 0.058 0.178 0.119
2003–2004 0.020 0.037 −0.076 −0.018 0.077 0.198 0.121
2004–2005 −0.020 0.004 −0.024 −0.016 0.016 0.145 0.128
2005–2006 0.073 0.094 −0.047 −0.021 0.046 0.181 0.135
2006–2007 0.088 0.115 −0.124 −0.028 0.125 0.231 0.107
2007–2008 −0.009 0.130 −0.085 −0.036 0.075 0.209 0.134
2008–2009 0.139 0.069 −0.031 −0.024 0.052 0.184 0.132
2009–2010 0.010 0.065 −0.036 −0.024 0.065 0.200 0.135
2010–2011 0.041 0.046 −0.037 −0.030 0.062 0.232 0.170
2011–2012 0.067 0.073 −0.002 −0.014 0.010 0.153 0.144
2012–2013 0.021 0.033 −0.037 −0.019 0.043 0.206 0.163
2013–2014 0.065 0.090 −0.047 −0.025 0.047 0.210 0.163
2014–2015 0.107 0.126 −0.077 −0.023 0.081 0.197 0.116
2015–2016 0.035 0.074 −0.106 −0.014 0.081 0.223 0.141
Total 0.558 0.953 −0.945 −0.398 0.947 3.179 2.233
Light industry 0.245 0.652 −0.633 −0.260 0.486 1.692 1.206
Heavy industry 0.050 0.133 −0.238 −0.063 0.218 0.777 0.560
Other industry 0.263 0.168 −0.074 −0.075 0.243 0.710 0.467
State-owned firms −0.435 0.058 −0.408 −0.023 −0.062 0.422 0.485
Private firms 0.993 0.895 −0.537 −0.374 1.009 2.757 1.748
Small and medium firms 0.445 0.389 −0.120 −0.233 0.409 1.631 1.222
Large firms 0.112 0.565 −0.825 −0.165 0.538 1.548 1.010
Note: TFP is estimated by ACF method
Table AV.
Dynamic
decompositions of
productivity growth
change 2000–2016
(percent)
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