Two-sided markets is one of the hottest areas in economics and competition policy. Some businesses operate platforms that connect two groups of customers, help those customers interact, and in doing so create value. Economists and antitrust practitioners have known for a long time that advertising-supported media had two groups of customers: the readers and the advertisers. But only since 2000 have economists understood that having two groups of distinct customers is a common feature of many businesses, old and new, and that this feature has tremendous implications for the economics of these businesses. From shopping malls to computer-operating systems to payment schemes to search-based advertising, two-sided issues loom large.
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