A rapidly growing literature has shown that market concentration among domestic firms has increased in the United States over the last three decades. Using confidential census data for the manufacturing sector, we show that typical measures of concentration, once adjusted for sales by foreign...

Facebook and Google and other internet giants are multisided markets (MSM). The user-side of the market, prices are zero - "free." On the other side of the market, Facebook's and Google's revenues are derived from advertising which appears when the users click on advertisers' web sites. They can...

Across the globe, Google, Amazon, Facebook, Apple and Microsoft have accumulated power in ways that existing regulatory and intellectual frameworks struggle to comprehend. A consensus is emerging that the power of these new digital monopolies is unprecedented, and that it has important...