This paper provides a new theory for two-sided payment card markets. Adopting payment cards requires consumers and merchants to pay a fixed cost, but yields a lower marginal cost of making payments. Analyzing adoption and usage externalities among heterogeneous consumers and merchants, our...

The debit card interchange fee regulation introduced by the Durbin Amendment to the Dodd-Frank Act went into effect in October 2011. The regulation limits the maximum permissible interchange fee that a covered issuer can collect from merchants for a debit card transaction. In this article, we...