This study examines the association between U.S. Census industry concentration measures and the informativeness of corporate disclosure policy. We find that in more concentrated industries firms' management earnings forecasts are less frequent and have shorter horizons, their disclosure ratings...

Industry concentration measures calculated with Compustat data, which cover only the public firms in an industry, are poor proxies for actual industry concentration. These measures have correlations of only 13% with the corresponding U.S. Census measures, which are based on all public and...

We test two potential hypotheses regarding the effects of major customer concentration on firm profitability. Under the collaboration hypothesis, customer power facilitates collaboration and both the supplier firm and its major customers obtain benefits. Under the competition hypothesis,...