WPS4390 Policy ReseaRch WoRking PaPeR 4390 Product Standards, Harmonization, and Trade: Evidence from the Extensive Margin Ben Shepherd The World Bank Development Research Group Trade Team November 2007 Policy ReseaRch WoRking PaPeR 4390 Abstract The author uses a new database of EU product standards proves highly robust to sample changes and instrumental in the textiles, clothing, and footwear sectors to present variables estimation using instruments motivated by the first empirical evidence that international standards political economy considerations. Moreover, it is found harmonization is associated with increased partner to be around 50 percent higher for low income countries, country export variety. A 10 percentage point increase in which suggests that they may be particularly constrained the proportion of internationally harmonized standards is in adapting products to meet multiple standards. associated with a 0.2 percent increase in partner country Numerical simulations show that these findings are export variety, whereas a 10 percent increase in the consistent with a heterogeneous firms model of trade in total number of standards is associated with a nearly 6 which harmonization is beneficial at the extensive margin percent decrease in product variety. Although small, the provided that any increases in compliance costs are not harmonization elasticity is statistically significant, and too large. This paper--a product of the Trade Team, Development Research Group--is part of a larger project on trade costs, trade facilitation, and economic development, supported through a Trust Fund of the U.K. Department for International Development (http://econ.worldbank.org/projects/trade_costs). Policy Research Working Papers are also posted on the Web at http://econ.worldbank.org. The author may be contacted at bshepherd@worldbank.org. The Policy Research Working Paper Series disseminates the findings of work in progress to encourage the exchange of ideas about development issues. An objective of the series is to get the findings out quickly, even if the presentations are less than fully polished. The papers carry the names of the authors and should be cited accordingly. The findings, interpretations, and conclusions expressed in this paper are entirely those of the authors. 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