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Determinants of Intra-Industry Trade: An Investigation with Bma for the European Union

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Journal of International Business Research and Marketing
Volume 5, Issue 6, September 2020, Pages 19-22


Determinants of Intra-Industry Trade: An Investigation with Bma for the European Union

DOI: 10.18775/jibrm.1849-8558.2015.56.3003
URL: http://dx.doi.org/10.18775/jibrm.1849-8558.2015.56.3003

Krzysztof Beck

Lazarski University, Poland

Abstract: The empirical literature on determinants of intra-industry trade (IIT) is vast and comprehensive, yet as the authors failed to properly account for model uncertainty it has brought inconsistent and conflicting results. To resolve this issue, Bayesian model averaging was applied to investigate the robustness of 48 potential determinants of bilateral IIT for the panel of 26 European Union countries over the 1999-2011 period. Application of BMA demonstrated that 11 of them are robust determinants of IIT, namely real GDP product, trade openness, membership in the European Union and the Euro area, corruption, and differences in factor abundance. Among the factors of production, the key role in the determination of IIT patterns can be assigned to the differences in human capital. Yet, transportation cost and cultural similarity have no impact on the IIT patterns.

Keywords: intra-industry trade, Bayesian model averaging, European Union

Determinants of Intra-Industry Trade: An Investigation with Bma for the European Union

1. Introduction

Intra-industry trade (IIT) is at the heart of European integration. A high degree of IIT promotes more symmetrical distribution of economic shocks and, in turn, tighter business cycle synchronization. Only when business cycles of a given group of countries are fairly synchronized, can the countries give away their independent monetary and exchange rate policy to a supranational institution in order to constitute an effectively functioning currency union. For these reasons, IIT should be one of the main concerns of the Euro area current as well as potential members. For many years the authors have been trying to establish what factors are the determinants of intra-industry trade (e.g.. Sharma, 2004; Thorpe and Zhang, 2005; Zhang and Clark, 2009; Jensen and Lüthje, 2009; Sawyer et al., 2010; Dautovic et al., 2014), yet none of them took into account model uncertainty, which leads to many conflicting and inconsistent results. For this reason, this paper presents the results of the sensitivity analysis of the determinants of IIT with Bayesian model averaging (BMA). Thus far, there has been only one attempt at sensitivity analysis of determinants of IIT (Torstensson, 1996). Using a rather outdated (by current standards) methodology, the author analyzed 17 determinants of IIT on the Swedish data and found that only physical capital intensity and transportation cost are robust. The paper is organized as follows. The first two sections describe data and estimation strategy, while the other two present results and conclusions.

2. Data and Measurement

The analysis covers 26 European Union countries, namely: Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxemburg, Netherland, Poland, Portugal, Romania, the Slovak Republic, Slovenia, Spain, Sweden, and the United Kingdom. All variables are in bilateral form – for 26 countries, it amounts to 325 country pairs. The time span of the research covers the period between 1999 and 2011. As most of the variables used in the research are characterized by unit root1, first differences were used. Consequently, the balanced panel consists of 3900 observations.

The dependent variable is the first difference of the natural logarithm of intra-industry trade measured by the sum of imports and exports of intermediate goods within the same sector between a pair of countries in each year. IIT is measured with the division of the economy into 35 different sectors and the data for IIT comes from World Output-Input Database (WOID). The list of the independent variables along with their descriptions and data sources are given in Table 1. The set of regressors is made up of variables describing differences in absolute and relative factor endowments, gravity variables, structural similarity, as well as macroeconomic, institutional and cultural indicators. In total, the set amounts to 48 regressors.

3. Estimation Strategy

To find a set of robust determinants of intra-industry trade, Bayesian model averaging (BMA) under different prior specification was applied. A detailed description of BMA (Hoeting, et al., 1999; Beck, 2017) and prior structure (Fernández, et al., 2001; Ley and Steel, 2009 and 2012, Feldkircher and Zeugner, 2009, Eicher, et al., 2011) is left for references. The particular estimation strategy, customized for the problem at hand, along with the key BMA statistics is described in this subsection. As a high degree of multicollinearity among the regressors is possible, an appropriate prior structure has been employed to deal with this issue.

Table 1: Data description

VARIABLE DESCRIPTION SOURCE
ARABLE ∆ absolute value of the difference in arable land WB
ARABLEpw ∆ absolute value of the difference in arable land per worker PWT& WB
B common border dummy
BCIDIFF ∆ absolute value of the difference in Bayesian corruption Index BCI
BCIPROD ∆ product of the values of Bayesian Corruption Index BCI
CAP ∆ absolute value of the difference in capital PWT
CAPAREABLE ∆ absolute value of the difference in capital to arable land ratio PWT & WB
CAPLAND ∆ absolute value of the difference in capital to land ratio PWT & WB
CPW ∆ absolute value of the difference in capital per worker PWT
CPWARABLE ∆ absolute value of the difference in capital per worker to arable land ratio PWT & WB
CPWLAND ∆ absolute value of the difference in capital per worker to land ratio PWT & WB
EMPL ∆ absolute value of the difference in employment PWT
EMPLARABLE ∆ absolute value of the difference in employment to arable land ratio PWT & WB
EMPLLAND ∆ absolute value of the difference in employment to land ratio PWT & WB
EPCpc ∆ absolute value of the difference in electricity consumption per capita WB
EU membership in the European Union dummy
FDID absolute value of the difference in FDI flows UNCTAD
GOV ∆ absolute value of the difference of government shares in GDP PWT
HUMAN absolute value of the difference in human capital PWT
HUMANARABLE ∆ absolute value of the difference in human capital to arable land ratio PWT & WB
HUMANCAP absolute value of the difference in human capital to capital ratio PWT
HUMANEMPL ∆ absolute value of the difference in human capital to employment ratio PWT
HUMANLAND absolute value of the difference in human capital to land ratio PWT & WB
IUp100 ∆ absolute value of the difference in number of internet users per 100 inhabitants WB
DKSI ∆ KSI for value added under the division of the economy into 35 sectors WOID
L common language dummy (at least one official common language)
LAND absolute value of the difference in land WB
LANDpc absolute value of the difference in land per capita WB
LNDGEO natural logarithm of geographical distance between capitals (shortest way) in km Google Maps
LNPOPPROD ∆ natural logarithm of population product PWT
LNRGDPPROD ∆ natural logarithm of real GDP product PWT
MA dummy variable for a pair of countries sharing a marine border
MB dummy variable for a pair of countries with access to the ocean or the sea
MIGR absolute value of the difference in net migration per 1000 inhabitants Eurostat & PWT
MU membership in the Euro area dummy
OILpc ∆ absolute value of the difference in number of internet users per 100 inhabitants WB
OLDEU dummy variable for a pair of countries that were members of the EU before 2004
OPEN ∆ absolute value of the difference of imports+exports shares of GDP PWT
PATENT ∆ absolute value of the difference in number of patents per 1 million inhabitants WB
POPDIFF absolute value of the difference in population PWT
RGDPDIFF ∆ absolute value of the difference in real GDP PWT
RGDPpc ∆ absolute value of the natural logarithm of the difference in real GDP per capita PWT
RGDPpcPROD ∆ value of the real GDP per capita product PWT
TRADE1 value of the ratio of imports and export to the sum of two countries GDPs DOT & WB
TRADE2 value of the ratio of imports and export to the sum of two countries total trades DOT
TRANS dummy variable for a pair of transition countries IMF
URBAN ∆ absolute value of the difference in the urban population WB
URBANshare ∆ absolute value of the difference in share of the urban population PWT & WB
Abbreviations: ∆- first difference; KSI–Krugman specialization index; BCI-Bayesian Corruption Index (Standaert, 2015) PWT-Penn World Tables (Feenstra et al., 2015); WB-World Bank; DOT – International Monetary Fund Directions of Trade; UNCTAD-United Nations Conference on Trade and Development.

Source: Author’s own elaboration

A uniform model prior (Ley and Steel, 2009) is supplemented with a function accounting for multicollinearity (George, 2010) to obtain prior model probabilities:

where ? = (48) is the number of covariates, while |??| is the determinant of the correlation matrix for all the regressors in the model j. The uniform model prior implies equal probabilities assigned to all the models (?(??) ∝ 1), so the |??| component of (2) determines the distribution of the prior probability mass. The higher the multicollinearity between the variables, the closer the value of |??| to 0, and the lower the prior ascribed to a given model. Model space is reduced with MC3 (Markov Chain Monte Carlo model Composition) sampler (Madigan et al., 1995). The convergence of the chain is assessed by the correlation coefficient between the analytical and MC3 posterior model probabilities for the best 10000 models. The application of BMA requires the specification of g prior. Benchmark prior rule (Fernández, et al., 2001) dictated the choice of unit information prior (UIP) (Kass and Wasserman, 1995) for the dataset at hand. Additionally, risk inflation criterion (RIC) put forward by Foster and George (1994) was employed in the main results. The combination of prior model probabilities with the values of likelihood function allows to calculate posterior model probability as:

where ?(?|??) denotes model specific marginal likelihood, ? given data set, and because ?(?) = ∑?=12K?(?|? )j∗?(?)j model weights can be treated as probabilities. Then the posterior mean (PM) of the coefficient ??, independent of the space of the models is given by:

where ?i,j= ?(?i |?, ?j ) is the value of the coefficient ?estimated with OLS for the model ??. The posterior standard deviation (PSD) is equal to:

where ?(??|?, ??) denotes the conditional variance of the parameter for the model ??. To better capture the relative impact of the determinants on the intra-industry trade standardized coefficients were calculated and BMA statistics based on their values. SPM denotes the standardized posterior mean, while SPSD denotes standardized posterior standard deviation (Doppelhofer and Weeks, 2009). The posterior probability of including the variable in the model – posterior inclusion probability (PIP) – is calculated as:

where ?? = 1 signifies including the variable ?? in the model. In all applications of BMA here, prior inclusion probability is 0.5, and a variable is classified as robust if PIP is above that value. The posterior probability of a positive sign of the coefficient in the model – ?(+) – is calculated in the following way:

where ??? denotes cumulative distribution function, while ??? ≡ (?̂i /?̂?i | M).

4. Results

The results of the application of BMA to the data set are depicted in table 2. BMA specification included 0.1 million burn-ins and 1 million iterations, which resulted in correlation coefficient between the analytical and MC3 posterior model probabilities for the best 10000 models above 0.999 in both cases, ergo the convergence of the chain was achieved. The first variable classified as robust is the natural logarithm of the real GDP product (LNRGDPPROD) with PIP equal to one for both g prior specifications. The posterior mean indicates that one percent increase in LNRGDPPROD is associated with an increase in IIT by approximately 0.69 percent. This confirms that gravity works in case of the IIT, just as in the instance of the total trade. On the other hand, geographical distance (DGEO), border dummy (B), and common language dummy (L) are fragile, which suggests that transportation costs and cultural similarities are not important for the determination of the intra-industry trade. Change in the degree of the openness (OPEN) is the second variable with posterior inclusion probability higher than prior. OPEN is characterized by a positive posterior mean, which indicates that more open countries are generally more involved in IIT. This could be explained by the fact that more open countries are more integrated into global value chains, which can account for the significant part of the intra-industry trade in intermediate goods. The product of Bayesian Corruption Index (BCIPROD) is characterized by posterior inclusion probability equal to 1 under both g priors. The regressor is characterized by a negative posterior mean, which suggests that the higher degree of corruption is associated with lower IIT. This result should not come as a surprise, as companies moving part of their production abroad will try to avoid risk and additional costs associated with corrupt administration. Membership in the European Union (EU) as well as in the Euro area (MU) are classified as robust regardless of the used g prior specification. In a rather unexpected turn, values of the posterior mean for both EU and MU are negative, suggesting that countries in either of these associations are trading less with one another. In other words membership in the EU and the Eurozone is associated with lower intra-industry trade growth by around 5% a year. This result is the consequence of the analysis of the growth rates. Old members of the EU and the Euro area are characterized by higher levels of IIT. Application of OLS or BMA at level results in the positive values of coefficients or posterior mean respectively. This in turn indicates that intra-industry is growing between old EU members and the new member states, and it shows that these countries are consecutively more interlinked in European value chains. It should be underlined that dummy variable EU and MU takes the value of 1 only if both countries are members of the European Union or the Euro area respectively. The last six robust variables are differences in absolute or relative factor endowments.

Four of them involve human capital, which indicates that this is the key factor of production for intra-industry trade. The absolute value of the difference in human capital to employment ratio (HUMANEMPL), human capital to land ratio (HUMANLAND), and human capital to physical capital ratio (HUMANCAP) are all characterized by the negative value of the posterior mean. The negative posterior mean indicates that countries characterized by a similar level of human capital to other factors ratios are engaged in more IIT. This suggests that traded goods are characterized by similar human capital intensity, and they must compete with the foreign counterparts. Accordingly, one can expect that human capital intensive goods account for the sizable part of intra-industry trade (product of human capital in two countries is positively and significantly correlated with IIT). Additionally, these results give support to theories associated with horizontal IIT (e.g.. Krugman, 1981). On the other hand, the absolute value of the difference in human capital to arable land (HUMANARABLE) is characterized by a positive posterior mean. This result points to vertical integration, where human capital abundant countries are moving low skilled parts of the value chains to countries with abundant natural resources and arable land. Alternatively, the negative posterior mean can be explained by theories associated with vertical IIT (e.g.. Flam and Helpman, 1987). Differences in absolute levels of employment (EMPL) are characterized by posterior inclusion probability of 0.94 and

0.96 for UIP and RIC respectively. A positive posterior mean indicates that higher differences in the level of employment are related to higher growth rates of IIT. This result can be attributed to vertical integration, as countries’ scare labor force might search for the location of labor intensive parts of the value chain in the countries that are labor abundant. Finally, differences in arable land per worker (ARABLEpw) are the last variable classified as a robust determinant of IIT. It is characterized by a negative posterior mean, which implies that differences in arable land to labor ratio are deteriorating intra-industry trade. Accordingly, one can expect that arable land abundant countries will engage in trade in agrarian products, but depending on their particular location the exact nature of the products will be different.

Table 2: BMA statistics under UIP and RIC

g prior Unit Information Prior Risk Inflation Criterion
VARIABLE PIP PM PSD SPM SPSD P(+) PIP PM PSD SPM SPSD P(+)
LNRGDPPROD 1.00 0.69 0.13 0.17 0.03 1.00 1.00 0.69 0.13 0.17 0.03 1.00
OPEN 1.00 0.42 0.05 0.13 0.02 1.00 1.00 0.42 0.05 0.13 0.02 1.00
HUMANEMPL 1.00 -0.40 0.05 -0.19 0.02 0.00 1.00 -0.40 0.05 -0.19 0.02 0.00
BCIPROD 1.00 0.00 0.00 -0.09 0.02 0.00 1.00 0.00 0.00 -0.09 0.02 0.00
HUMANLAND 1.00 -131 36.5 -0.13 0.03 0.00 1.00 -135 37.3 -0.13 0.04 0.00
MU 0.99 -0.05 0.01 -0.07 0.02 0.00 1.00 -0.05 0.01 -0.07 0.02 0.00
EU 0.97 -0.05 0.01 -0.07 0.02 0.00 0.97 -0.05 0.01 -0.07 0.02 0.00
EMPL 0.94 0.00 0.00 0.06 0.02 1.00 0.96 0.00 0.00 0.06 0.02 1.00
HUMANCAP 0.79 -751 458 -0.05 0.03 0.00 0.83 -786 442 -0.05 0.03 0.00
HUMANARABLE 0.79 1.25 0.75 0.05 0.03 1.00 0.77 1.20 0.75 0.05 0.03 1.00
ARABLEpw 0.64 -0.01 0.00 -0.04 0.03 0.00 0.70 -0.01 0.00 -0.04 0.03 0.00
CPWLAND 0.35 0.01 0.02 0.02 0.03 1.00 0.42 0.02 0.02 0.03 0.03 1.00
LANDpc 0.33 0.00 0.00 -0.01 0.02 0.00 0.37 0.00 0.00 -0.02 0.02 0.00
RGDPpcPROD 0.20 0.00 0.00 -0.01 0.03 0.00 0.24 0.00 0.00 -0.02 0.03 0.00
ARABLE 0.14 0.00 0.00 0.01 0.02 1.00 0.16 0.00 0.00 0.01 0.02 1.00
CPWARABLE 0.09 0.00 0.00 0.00 0.01 1.00 0.09 0.00 0.00 0.00 0.01 1.00
CAPARABLE 0.07 0.00 0.00 0.00 0.01 0.00 0.09 0.00 0.00 0.00 0.01 0.00
RGDPDIFF 0.05 0.00 0.00 0.00 0.01 1.00 0.06 0.00 0.00 0.00 0.01 1.00
URBAN 0.05 0.00 0.00 0.00 0.01 0.00 0.06 0.00 0.00 0.00 0.01 0.00
MIGR 0.04 0.00 0.00 0.00 0.01 1.00 0.05 0.00 0.00 0.00 0.01 1.00
DKSI 0.03 0.01 0.06 0.00 0.00 1.00 0.04 0.01 0.07 0.00 0.00 1.00
UIp100 0.03 0.00 0.00 0.00 0.00 0.00 0.04 0.00 0.00 0.00 0.00 0.00
MA 0.03 0.00 0.00 0.00 0.00 1.00 0.04 0.00 0.00 0.00 0.00 1.00
OLDEU 0.03 0.00 0.00 0.00 0.00 0.00 0.03 0.00 0.00 0.00 0.00 0.00
B 0.03 0.00 0.00 0.00 0.00 0.00 0.04 0.00 0.00 0.00 0.00 0.00
GOV 0.02 -0.01 0.06 0.00 0.00 0.00 0.03 -0.01 0.06 0.00 0.00 0.00
TRANS 0.02 0.00 0.00 0.00 0.00 1.00 0.03 0.00 0.00 0.00 0.00 1.00
POPDIFF 0.02 0.00 0.00 0.00 0.00 0.01 0.03 0.00 0.00 0.00 0.00 0.01
FDID 0.02 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.00
MB 0.02 0.00 0.00 0.00 0.00 0.00 0.03 0.00 0.00 0.00 0.00 0.00
CAPLAND 0.02 0.00 0.00 0.00 0.01 1.00 0.03 0.00 0.00 0.00 0.01 1.00
HUMAN 0.02 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.00
LAND 0.02 0.00 0.00 0.00 0.00 0.00 0.03 0.00 0.00 0.00 0.00 0.00
BCIDIFF 0.02 0.00 0.00 0.00 0.00 0.00 0.02 0.00 0.00 0.00 0.00 0.00
TRADE1 0.02 0.00 0.07 0.00 0.00 1.00 0.02 0.01 0.08 0.00 0.00 1.00
EPCpc 0.02 0.00 0.00 0.00 0.00 1.00 0.03 0.00 0.00 0.00 0.00 1.00
LNDGEO 0.02 0.00 0.00 0.00 0.00 0.99 0.02 0.00 0.00 0.00 0.00 0.99
PATENT 0.02 0.00 0.00 0.00 0.00 0.96 0.02 0.00 0.00 0.00 0.00 0.96
RGDPpc 0.02 0.00 0.01 0.00 0.00 1.00 0.02 0.00 0.02 0.00 0.00 0.99
URBANshare 0.02 -0.01 0.12 0.00 0.00 0.00 0.02 -0.01 0.13 0.00 0.00 0.00
EMPLARABLE 0.02 0.00 0.00 0.00 0.00 0.13 0.02 0.00 0.00 0.00 0.00 0.15
L 0.02 0.00 0.00 0.00 0.00 0.97 0.02 0.00 0.00 0.00 0.00 0.98
CPW 0.02 0.00 0.00 0.00 0.00 0.37 0.02 0.00 0.00 0.00 0.00 0.33
TRADE2 0.02 0.00 0.02 0.00 0.00 0.21 0.02 0.00 0.03 0.00 0.00 0.22
CAP 0.01 0.00 0.00 0.00 0.00 0.13 0.02 0.00 0.00 0.00 0.00 0.13
LNPOPPROD 0.01 0.00 0.00 0.00 0.00 0.91 0.02 0.00 0.00 0.00 0.00 0.87
OILpc 0.01 0.00 0.00 0.00 0.00 0.19 0.02 0.00 0.00 0.00 0.00 0.16
EMPLLAND 0.01 0.00 0.00 0.00 0.00 0.41 0.02 0.00 0.00 0.00 0.00 0.46

Source: Author’s own elaboration

Turning to standardized posterior means, the product of GDPs and differences in human capital to employment ratios have the strongest impact on the growth rate of IIT. Second in line are the degree of openness and differences in human capital to land ratios followed by product of Bayesian Corruption Index. Next in line are memberships in the Euro area and the European Union succeeded by differences in employment, the differences in human capital to arable land and human capital to physical capital ratios. Finally, differences in arable land per worker have the lowest impact on intra-industry trade among all the robust variables. All the above- mentioned results turned out to be robust to manipulation in g prior and model prior specification. Additional robustness checks are not reported here for brevity, but are available upon request.

5. Conclusions

Application of BMA to the panel data for 26 European Union countries over the 1999-2011 period allowed for the identification of 11 robust determinants of intra-industry trade. Out of traditional gravity model variables, only product of real GDP turned out to be robust, while transportation cost and cultural similarity proxies are classified as fragile. Corruption seems to provide strong impairment on IIT as additional risk and costs associated with it disincentivize potential investors from moving part of the production abroad. The general level of openness is positively related to the intra-industry trade with more open countries being better integrated into global value chains. Memberships in the EU and the Eurozone have a positive impact on the level of IIT, but negative on the growth rate of intra-industry trade. This result suggests that new member states are getting more entangled in old EU value chains. Finally, the analysis showed the crucial role of the differences in the factor abundance of the trading countries. Out of all the analyzed factors of production, the most important part in the determination of intra- industry trade patterns is played by human capital.

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