“This is perhaps the most consequential aspect of this case, and I think the European Commission got it exactly right. Last year in Antitrust and Aggregation I explained why the unique dynamics of the Internet push towards dominant players that look very different from the monopolies of the past:

Aggregation Theory is about how business works in a world with zero distribution costs and zero transaction costs; consumers are attracted to an aggregator through the delivery of a superior experience, which attracts modular suppliers, which improves the experience and thus attracts more consumers, and thus more suppliers in the aforementioned virtuous cycle. It is a phenomenon seen across industries including search (Google and web pages), feeds (Facebook and content), shopping (Amazon and retail goods), video (Netflix/YouTube and content creators), transportation (Uber/Didi and drivers), and lodging (Airbnb and rooms, Booking/Expedia and hotels).

The first key antitrust implication of Aggregation Theory is that, thanks to these virtuous cycles, the big get bigger; indeed, all things being equal the equilibrium state in a market covered by Aggregation Theory is monopoly: one aggregator that has captured all of the consumers and all of the suppliers. This monopoly, though, is a lot different than the monopolies of yesteryear: aggregators aren’t limiting consumer choice by controlling supply (like oil) or distribution (like railroads) or infrastructure (like telephone wires); rather, consumers are self-selecting onto the Aggregator’s platform because it’s a better experience.”

Ends, Means, and Antitrust
https://stratechery.com/2017/ends-means-and-antitrust/
via Instapaper