The literature on two-sided markets is developing rapidly. To this point, the major focus of the economic research on two-sided markets has been to address how the intermediary (or "the platform") sets prices for both sides of the market simultaneously. A great deal more could be done on this topic. Less well studied are a number of other important choices, like the choice over how open to be, or how many sides of the market to allow. The literature has important policy implications for pricing analysis, an important feature of regulation and a large part of antitrust analysis.
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