Abstract
Studies comparing industry concentration in Europe and USA have faced three challenges: obtaining data on sub-national level in Europe and sub-state level in the USA, disaggregating data into relevant and comparable industry groups, and devising a method for a consolidated comparison between the two continents. This paper reviews five previous studies, and presents a new comparison. It is based on considerably more granular data than previously used, a new grouping of industries, and applies the polarisation measure as a consolidated indicator of total industry concentration. The results confirm the previous conclusion that concentration is higher in the USA than in Europe, and show that this result is robust for different measures.