We estimate annual gravity equations for 1960-85 on a large sample, allowing us to identify time trends in the coefficients. Our results include the following: (1) The weight of exporter's supply has increased relative to importers' demand in explaining the long-run strong performancee of global...

As multilateral negotiations focus more on reductions and removal of non-tariff barriers (NTBs), the importance of quantifying the impact of these barriers has increased. Recent studies have derived ad valorem equivalents for NTBs for a large number of countries and/or products, but the...

Significant progress has been made in quantifying the effects of non-tariff measures since OECD commissioned its last major review of this topic in 1997. This paper reviews the literature of NTMs and assesses the different methods available. Additionally, the paper develops a series of questions...

Analyses of Colombian data have generally failed to confirm the hypothesis of export-led growth. This paper generates several measures of export diversification and structural change in exports, and argues that these measures are useful in assessing growth externalities generated by the export...