industries and (iv) marginally increases industry output concentration. Addressing the recent literature, we also control for …

This paper uses new data to reexamine trends in concentration in U.S. markets from 1994 to 2019. The paper's main … contribution is to construct concentration measures that reflect narrowly defined consumption-based product markets, as would be … higher than previous results. Also in contrast with the previous literature, we find that product market concentration has …

A rapidly growing literature has shown that market concentration among domestic firms has increased in the United … measures of concentration, once adjusted for sales by foreign exporters, actually stayed constant between 1992 and 2012. We … reconcile these findings by linking part of the increase in domestic concentration to import competition. Although concentration …

R&D intensity industries have a lower bound for concentration, which is higher than that for low sunk cost intensity …

gasoline market confirms that increases in concentration reduce product variety. Ignoring this product variety effect is likely …