Gravity Equations: Workhorse, Toolkit, and Cookbook* This chapter focuses on the estimation and interpretation of gravity equations for bilateral trade. This necessarily involves a careful consideration of the theoretical underpinnings since it has become clear that naive approaches to estimation lead to biased and frequently misinterpreted results. There are now several theory-consistent estimation methods and we argue against sole reliance on any one method and instead advocate a toolkit approach. One estimator may be preferred for certain types of data or research questions but more often the methods should be used in concert to establish robustness. In recent years, estimation has become just a first step before a deeper analysis of the implications of the results, notably in terms of welfare. We try to facilitate diffusion of best-practice methods by illustrating their application in a step-by-step cookbook mode of exposition.JEL Classification: F1

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Most independent nations today were part of empires in 1945. Using bilateral trade data from 1948 to 2006, we examine the effect of independence on post-colonial trade. While there is little short-run effect on trade, after four decades trade with the metropole (colonizer) has contracted by about 65%. Hostile separations lead to large, immediate reductions in trade. We also find that trade between former colonies of the same empire erodes as much as trade with the metropole, whereas trade with third countries decreases about 20%. The gradual trade deterioration following independence suggests the depreciation of some form of trading capital.

This paper develops a theoretical model of location choice under imperfect competition to formalize the notion that firms prefer to locate "where the markets are." The profitability of a location depends on a term that weights demand in all locations by accessibility. Using a sample of Japanese firms' choices of regions within European countries, we compare the theoretically derived measure of market potential with the standard form used by geographers. Our results show that market potential matters for location choice but cannot account entirely for the tendency of firms in the same industry to agglomerate. © 2004 President and Fellows of Harvard College and the Massachusetts Institute of Technology.

International audienceIn this paper, we contribute to the literature on the determinants of foreign direct investment in developing countries and re-evaluate the role of the quality of institutions on FDI independently of the general level of development. We implement cross-section estimations based on a newly available database with unprecedented detail on institutions for a set of 52 countries, as well as panel data estimations based on Fraser Institute's data. Furthermore, we control for the correlation between institutions and GDP per capita and for endogeneity of institutions. Finally, we evaluate whether the similarity of institutions between the host and the origin country raises bilateral FDI. We find that a wide range of institutions, including bureaucracy, corruption, but also information, banking sector and legal institutions, do matter for inward FDI independently of GDP per capita. Interestingly, weak capital concentration and strong employment protection tend to reduce inward FDI. Institutional proximity between the origin and the host country also matters, but we find little impact of institutions in the origin country. These results are encouraging in the sense that efforts towards raising the quality of institutions and making them converge towards those of source countries may help developing countries to receive more FDI, independently of the indirect impact of higher GDP per capita. The orders of magnitude found in the paper are large, meaning that moving from a low level to a high level of institutional quality could have as much impact as suddenly becoming a neighbour of a source country

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F12, F15,