Discussion paper
DP11532 Why Do Estimates of the EMU Effect On Trade Vary so Much?
Larger data sets, with more countries and a longer span of time, exhibit systematically larger effects of European monetary union on trade. I establish this stylized fact with meta-analysis and confirm it by estimating a plain-vanilla gravity model. I then explain this finding by examining systematic biases in “multilateral resistance to trade” manifest in time-varying country fixed effects; bias grows as the sample is truncated by dropping small poor countries.
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