Antitrust issues in international comparisons of market structure

The international comparison of market structure is complicated by a lack of adequate and comparable data. This paper addresses the issues encountered in the construction of international market data from financial reports, and provides a method for the comparison of market concentration and industry diversity. A firm-level data set is constructed to compute comparable measures of market concentration and industry diversity in the food industries for the U.S. and European Community. An innovation is the imputation of the distribution of sales of sub-code products by firm and the construction of nonparametric tests.