The World Bank and the United NationsEconomic and Social Commission for Asia and the Pacific(UNESCAP) jointly prepared a new global data set ofbilateral trade costs based on trade and production data.Accessible on the World Bank Open Data Web site, it opensnew analytical possibilities for policy makers andresearchers working on trade integration. The data stressthe importance of supply chains and connectivity constraintsin explaining the higher costs and lower levels of tradeintegration observed in developing countries. To measuretrade costs in the developing world over the 1995-2010period, UNESCAP and the World Bank embarked on a joint datacollection exercise. In addition to data on export andimport flows, calculation of trade costs using the inversegravity methodology also requires information on domesticproduction in each country. Usage can then be calculated asdomestic production less total exports. The result of thedata collection exercise is a database covering up to 178countries, two sectors, and the 1995-2010 period. Based onthe available data, trade costs data are calculated for asmany bilateral pairs as possible, and interpolation used tofill in missing country- year combinations when feasible.