The Estimated Trade Effects of the Euro: Why Are They Below Those From Historical Monetary Unions Among Smaller Countries?

This paper seeks to address two questions. First, do the effects on intra-euroland trade that were estimated in the euro’s first four years hold up in the second four years? The answer is yes. Second, and more complicated, what is the reason for the big discrepancy vis-à-vis other currency unions? We investigate three prominent possible explanations for the gap between 15% and 200%. First, lags. The euro is still very young. Second, size. The European countries are much bigger on average than most of those who had formed currency unions in the past. Third, endogeneity of the decision to adopt an institutional currency link. Perhaps the high correlations estimated in earlier studies were spurious, an artifact of reverse causality. We test the hypotheses regarding lags and size directly; and we address the endogeneity problem by means of a natural experiment involving trade between the CFA countries of Africa and the euro countries of Europe. Contrary to expectations, we find little evidence that any of these factors explains a substantial share of the gap, let alone all of it.