Abstract
In paragraph iv pharmaceutical cases, a patent-litigation decision often determines whether a brand-firm monopoly continues or generic entry occurs. Using unique patent-litigation data and an event-study approach that accounts for probabilistic district court decisions and an appellate process, we estimate that brand-firm stakes in such cases average $4.3 billion while generic-firm stakes average $204.3 million. After the Schering-Plough v. FTC decision in 2002 that upheld a settlement in which the brand firm paid the generic firm in return for delayed entry, we find that settlement is more likely and stakes are significantly lower, despite greater average brand sales for the drugs in the cases. On the basis of this evidence, we conclude that pay-for-delay settlements led to less within-market competition after 2002.
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