On Gravity,Specialization and Intra‐industry Trade

Contrary to the popular belief, specialization is not necessary for gravity equations. This paper shows that the simple gravity equation holds if and only if the market share of an exporting country is constant across all importing countries. Specialization is just one special case satisfying this condition. The constant‐share condition can hold in a variety of situations where multiple producers compete with a homogeneous good. Further, this paper shows that the ratio of bilateral trade to the product of partner incomes is increasing in the extent of specialization and in the intensity of intra‐industry trade. Since the relationship is not model‐specific, the correlations among these variables do not support any specific model.     

Exchange rate uncertainty and US bilateral fresh fruit and fresh vegetable trade: an application of the gravity model

In order to analyse the effect of exchange rate uncertainty, we apply an empirical gravity equation to two sets of US bilateral trade data: fresh fruit over the period 1976–1999 for a panel of 26 countries; and fresh vegetables over the period 1976–2006 for a panel of nine countries. Based on panel estimation methods, and using both a moving SD measure and the Perée and Steinherr (1989) measure of exchange rate uncertainty, the results show that US bilateral fresh fruit trade has been negatively affected by exchange rate uncertainty. We also find some evidence that the exchange rate between the US dollar and the currencies of Latin American trading partners accounts for most of the negative impact of exchange rate uncertainty on bilateral trade flows in fresh fruit. In contrast, when using panel estimation methods and both measures of exchange rate uncertainty, we find no statistically significant evidence for any negative effect of exchange rate uncertainty on US bilateral fresh vegetable trade. However, we do find a statistically significant negative effect for exchange rate uncertainty when we estimate a US export gravity equation for fresh vegetables using the same panel of countries.     

Consistent Estimates of Regional Blocs' Trade Effects

This paper builds upon Feenstra (2002) to obtain consistent estimates of trade effects of regional blocs by adding bilateral effects to the gravity equation and analyzing its variation across blocs of different intensity. The results are then compared across different gravity equations used in the literature only to observe significant variation in sign, magnitude, and significance. The consequent equation shows that the effect is positive for economics cooperation agreements and preferential trade agreements, but free‐trade agreements do not have a significant incremental effect. While customs unions have a positive incremental effect over blocs of lower intensity, the incremental effect is mixed for monetary unions, and negative for economic areas and full integrations. Furthermore, the effect varies with the duration and degree of implementation as well as the coverage of blocs. Lastly, changes in trade effects of the European blocs across time observed and policy implications are discussed.     

Trade implications of the Euro in EMU countries: a panel gravity analysis

In this paper, we study the intra-EMU and intra-Eurozone trade effects of the euro adoption on 29 European Economic and Monetary Union countries (including 17 Eurozone economies and Iceland) from the period 1994 through 2011. We employ a generalized gravity model that controls for an extended set of trade theory and policy variables. The gravity model is estimated using the robust panel data techniques that includes times effects, besides country-specific effects. The various econometric specifications of the gravity equation, on the whole dataset of 29 economies, yield positive and significant impact (to be around 14 %) of the euro currency adoption on bilateral trade flows. Next, euro effect on bilateral trade and exports on a smaller dataset is estimated. The estimated results suggest that bilateral trade and exports increase by 20.81 and 18.57 %, respectively, when both the countries belong to the Eurozone. This effect is larger than the one obtained when only one of the two trading partners uses the euro as its currency. In addition, the validity of the assumptions of Heckscher–Ohlin (H–O) theory are checked for the countries under study. The estimated results reject the H–O theory in favor of Modern Trade theories. However, the low value of the coefficient on respective variable suggests that, over the period, the type of trade among these countries has transited from inter-industry trade to horizontal intra-industry trade. This suggests that these developed European economies are on the path of economic convergence via intra-industry trade.     

汇率变动对中国出口贸易的影响

在理论上汇率上升会降低出口贸易,在实证上却出现相反的结论。在人民币对美元不断升值的情况下,中国的对外出口贸易却迅速增加。垂直专业分工到双边贸易的引力模型就中国与世界30个主要贸易对象的出口贸易数据研究表明,国际垂直专业化分工使得出口的汇率弹性降低。因此,传统汇率理论会导致弹性的高估,在国际垂直分工下希望通过人民币升值降低中国的贸易顺差也难以实现。     

DOES THE GRAVITY MODEL EXPLAIN SOUTH KOREA'S TRADE FLOWS?*

This paper applies the gravity model to explain South Korea's bilateral trade flows and to extract practical trade policy applications. A trade structure and an Asian‐Pacific trade network are included in the gravity equation to characterize the peculiarity of South Korea's trade patterns. The empirical result shows that South Korea's trade follows a Heckscher–Ohlin model more than an increasing returns or a product differentiation model. South Korea has large unrealized trade potentials with Japan and China, suggesting that they are desirable partners for an FTA. North–South Korean trade will expand markedly if bilateral relation normalizes and North Korea participates in APEC.     

The Global Disconnect: The Role of Transactional Distance and Scale Economies in Gravity Equations

Recent empirical analyses show that asset flows can be modelled by the same 'gravity' equations that trade economists have used so successfully for the past few decades. This is something of a surprise. Trade economists do not yet have a unified theory of why gravity models should work‐and the situation is worse for asset flows. Reasonable theories would predict that greater distance between countries should generate more asset flows rather than less as the econometric results seem to consistently show. In this paper we discuss how host and source country GDPs, language, and distance the core explanatory variables in the traditional gravity models‐fare in trade and asset flows estimations. While the 'distance puzzle' is not resolved, it is considerably reduced by going beyond consideration of physical distance to concepts of transactional distance and scale economies.     

Economic integration agreements,border effects,and distance elasticities in the gravity equation

Using a novel common econometric specification, we examine the measurement of three important effects in international trade that historically have been addressed largely separately: the (partial) effects on trade of economic integration agreements, international borders, and bilateral distance. First, recent studies focusing on precise and unbiased estimates of effects of economic integration agreements (EIAs) on members׳ trade may be biased upward owing to inadequate control for time-varying exogenous unobservable country-pair-specific changes in bilateral export costs (possibly decreasing the costs of international relative to intranational trade); we find evidence of this bias using a properly specified gravity equation. Second, our novel methodology yields statistically significant estimates of the declining effect of “international borders” on world trade, now accounting for endogenous EIA formations and unobserved country-pair heterogeneity in initial levels. Third, we confirm recent evidence providing a solution to the “distance-elasticity puzzle,” but show that these estimates of the declining effect of distance on international trade are biased upward by not accounting for endogenous EIA formations and unobserved country-pair heterogeneity. We conclude our study with numerical general equilibrium comparative statics illustrating a substantive difference on trade effects of EIAs with and without allowance for the declining effects of international borders on world trade.     

Immigration and the Trade of Provinces

A link between immigration, imports, and exports has been found by a number of papers that have used the gravity equation to analyze bilateral trade patterns. We discuss what this research implies about the mechanisms through which immigrants expand trade and identify strengths and weakness of the various approaches. This paper also contributes to this literature by estimating immigrant effects for Canada using cross‐province variation in international trade and immigration patterns. We derive an alternative functional form capturing the relationship between immigration and trade based on the proposition that immigrants use their connections and superior 'market intelligence' to exploit trade opportunities that non‐immigrants do not access. We find that the average new immigrant expands exports to his/her native country by $312 and expands imports by $944.     

Does it Matter Who You Sign With? Comparing the Impacts of North–South and South–South Trade Agreements on Bilateral Trade

Free trade agreements (FTAs) lead to a rise in bilateral trade regardless of whether the signatories are developed or developing countries. Furthermore, the percentage increase in bilateral trade is higher for South–South agreements than for North–South agreements. The results are robust across a number of gravity model specifications in which we control for the endogeneity of FTAs (with bilateral fixed effects) and also take account of multilateral resistance in both estimation (with country‐time fixed effects) and comparative statics (analytically). Our analytical model shows that multilateral resistance dampens the impact of FTAs on trade by less in South–South agreements than in North–South agreements, which accentuates the difference implied by our gravity model coefficients, and that this difference becomes larger as the number of signatories rises. For example, allowing for lags and multilateral resistance, a four‐country North–South agreement raises bilateral trade by 53% while the analogous South–South impact is 107%.     

Trade, democracy, and the gravity equation

Does democracy affect trade? There are several channels by which democracy may affect trade, with differing implications. First, democratization in the exporting country can improve product quality and reduce trade costs, increasing bilateral trade. Second, democratization in the importing country may increase trade barriers and thus reduce imports. In this paper, I analyze the effect of democracy on trade by augmenting the gravity equation with democracy. Using a rich panel data set and controlling for the endogeneity of democracy, I find empirical evidence consistent with the hypothesis that democracy fosters trade. This finding is robust to various econometric methods and to the use of disaggregated specifications.     

Microeconomic analysis on the growth of trade volume in China: 1978–2007

The gravity equation is usually employed by researchers in the field of international trade to explain the growth of a country’s imports and exports volume, especially the manufactured goods. But in China, variables in the model, such as exchange rate, tariff, transportation cost, and spatial distance etc., are not sufficient to explain the riddle of China’s growth in trade volume. In fact, this growth in China’s trade volume is owing to the disintegration of production in the process of economic globalization, to the multinational corporations’ (MNC) vertical outsourcing of their manufacturing processes and procedures, and to the timely readjustment of Chinese enterprises on their strategies of participating in the international intra-product specialization. In this paper we establish an equilibrium model of intra-product specialization dominated by MNCs, and do some empirical tests on the growth in trade volume in China by using the variables including technological conditions of trade, similarity of economies, policy conditions of trade, disintegration of production and level of per capita capital equipment. The empirical results support our basic judgments.     

Trade frictions and welfare in the gravity model: how much of the iceberg melts?

Abstract.  A key element missing from the structural gravity literature is an examination of the implied general equilibrium. By design the gravity equation is adept at predicting bilateral trade flows. To make inferences beyond trade flows, however, the theoretic models should be consistent with other observables. Structural econometric estimates from Anderson and van Wincoop (2003) allow us to evaluate their proposed general equilibrium along several dimensions. We find that their gravity model predicts too large a difference between consumer and producer prices; excessive variation in the geographic distribution of consumer price indices; and an exceptionally large portion of output devoted to overcoming trade frictions. Under plausible parameterizations of the model at least 50% of output 'melts' in transit. JEL classification: F10     

The trade effects of Albania’s trade agreements with CEFTA members

Since the Central European Free Trade Agreement (CEFTA) was signed in 2006, Albanian exports to CEFTA member countries have increased four-fold. Applying a trade growth decomposition methodology, we show that Albanian firms that did not export to CEFTA countries before the agreement account for a large share of this export growth. Exports also increased among goods that were the least traded before the agreement. Estimating a gravity equation, we find that the CEFTA increased Albanian exports between 34% and 144%, depending on how the previous bilateral agreements with CEFTA countries are accounted for. Additional regression analyses conclude that the CEFTA fostered exports through the reduction of tariffs.     

Flows of people,flows of ideas,and the inequality of nations

The present paper examines a neglected determinant of aggregate productivity: temporary cross-border flows of people. We hypothesize that interaction between people from different nations facilitates the international diffusion of ideas, thus stimulating aggregate productivity. In order to assess the causal impact of people flows on productivity, we construct an instrument for people flows. By analogy to the trade/growth literature, this instrument is derived from a fitted gravity equation involving geographic determinants of bilateral travel flows. Our cross-section analysis reveal that greater international interaction leads to higher productivity; a very similar result, qualitatively as well as quantitatively, is obtained when we employ dynamic panel data methods for the purpose of identification.     

基于地区因素的产品内国际分工发展实证

本文通过基于我国各省份同典型国家和地区之间的引力模型,从不同角度讨论了影响我国各地区产品内国际分工水平的相关因素,发现市场规模大小、要素禀赋差异和地理因素均对产品内国际分工发展水平有显著影响,且这种影响因双边贸易规模差异、我国各省份发展差异以及关国家（地区）发展差异而有所不同。综合来看,重视影响因素的差异对促进我国各地区的产品内国际分工水平有重要意义。     

Estimating the effects of non‐discriminatory trade policies within structural gravity models

We propose a simple method to identify the effects of unilateral and non‐discriminatory trade policies on bilateral trade within a theoretically consistent empirical gravity model. Specifically, we argue that structural gravity estimations should be performed with data that include not only international trade flows but also intra‐national trade flows. The use of intra‐national sales allows identification of the effects of non‐discriminatory trade policies such as most favoured nation tariffs, even in the presence of exporter and importer fixed effects. A byproduct of our approach is that it can be used to recover estimates of the trade elasticity, a key parameter for quantitative trade models. We demonstrate the effectiveness of our techniques in the case of most favoured nation tariffs and “time to export” as representative non‐discriminatory determinants of trade on the importer and on the exporter side, respectively. Our methods can be extended to quantify the impact on trade of any country‐specific characteristics as well as any non‐trade policies.     

Moving to autarky,trade creation and home market effect: an exhaustive analysis of regional trade agreements in Africa

This article analyses the effects of Regional Trade Agreements (RTAs) on bilateral trade in Africa. A structural gravity equation is estimated over the period 1955–2014. The overall effect of RTAs on African trade is strong, but depending on the nature of the RTAs, there is a decreasing impact over time. While Economic Integration Agreements (EIAs) still favour trade in Africa, there was no trade creation coming from Free Trade Agreements between 1990 and 2014. However, the provisions of RTAs do not have a negative impact on trade: agreements that include behind-the-border policies do not significantly deter bilateral trade. To explain the declining impact of RTAs, we look at their redistributive impact between members states. There is no evidence that large countries disproportionally export diversified goods due to RTAs (no ‘home effect’). Countries with a good international network (‘hub effect’) benefited more than other countries of RTAs between 1955 and 1990 but this is however less true on the most recent period (1990–2014).     

Towards Trade Equalisation: A Network Perspective on Trade and Income Convergence Across the Twentieth Century

An enduring dynamic of the twentieth century is the dramatic expansion of global trade with increased partners, goods, frequency and volumes. Most trade explanations such as the Heckscher–Ohlin, new trade theory, gravity models, and Ricardo and Sraffa focus on how bilateral import and export volumes and intermediate input goods are driven by decreased financial and information transaction costs. Extending work on trade flows and economic development, we derive several network measures of degree, betweenness and eigenvector centrality from dyadic trade flows from 1960 to 2009. We then empirically explore the interactive effects of trade connectivity, economic production and stages of development on income convergence and trade equalisation. We empirically find clear patterns towards a new phenomenon, both sigma levels and beta rates trade convergence and equalisation for our entire sample. Visualising sigma and beta convergence for seven major trading nations from 1920 to 2010, we believe offers new insights into economic development theory if only beginning to loosen the knot of trade, growth and globalisation.     

The Transmission of Sustained Growth through the Terms of Trade in an Endogenous Growth Model

This paper develops a two‐country model of endogenous growth and international trade in intermediate goods. In autarky just one of the economies enjoys sustained growth. The trade situation may be characterized by complete specialization of both countries, or by incomplete specialization of the growing economy. In either case, trade transmits perpetual growth to the stagnant economy because of the permanent improvements in its terms of trade. The existence of a non‐reproducible factor in the growing economy is crucial to ensure propagation of growth. Moreover, under incomplete specialization countries converge in per capita income. This result relies on two assumptions. First, there must be a large enough share of world income to pay for the input in which the stagnant economy has comparative advantage. Second, all technologies producing intermediate goods should be equally intensive in the non‐reproducible factor.