Recent evidence suggests the U.S. business environment is changing, with rising market concentration and markups. The …

National industrial concentration in the U.S. has risen sharply since the early 1980s, but there remains dispute over … whether local geographic concentration has followed a similar trend. Using near population data from the Economic Censuses, we … confirm and extend existing evidence on national U.S. industrial concentration while providing novel evidence on local …

Concentration is a single summary statistic driven by two opposing forces: the number of firms in a market and the … evenness of their market shares. This paper introduces a generalized measure of concentration that allows researchers to vary … industrial employment concentration is driven by the Herfindahl Index's over-weighting of evenness and under-weighting of firm …

-2011. Using firm-level historical data, we document a novel fact: firm concentration rose substantially during the growth miracle … period. To understand whether rising concentration contributed positively or negatively to South Korean real income, we build … consequences of changing firm concentration: productivity, distortions, selection into exporting, scale economies, and …