Optimal price regulations in international pharmaceutical markets with generic competition.

In a two-country (home and foreign) model in which the home producer of a branded pharmaceutical product faces generic competition in each market, we analyze home's optimal policy choices regarding two major types of price regulations: external reference pricing (ERP) and direct price controls. Home's nationally optimal ERP policy lowers domestic price while maintaining the firm's export incentive. This ERP policy results in a negative international price spillover that the foreign country can (partly) offset via a local price control. Generic competition in either market reduces home's welfare gain from instituting an ERP policy. Weaker competition abroad or a greater weight on firm profits relative to consumer surplus in home's welfare function makes it more likely that home prefers an ERP policy to a price control. While international integration of national generic markets can improve welfare, such is not the case if it causes home to relax its ERP policy.