Patent pools, which combine complementary patents of competing firms, are expected to increase overall welfare – but potentially discourage innovation in substitutes for the pool technology. This paper exploits a new historical data set on changes in patenting and firm entry for a clearly...

A strong tradition in economic history, which primarily relies on qualitative evidence and statistical correlations, has emphasized the importance of patents as a primary driver of innovation. Recent improvements in empirical methodology - through the creation of new data sets and advances in...

What is the optimal system of intellectual property rights to encourage innovation? Empirical evidence from economic history can help to inform important policy questions that have been difficult to answer with modern data: 1) Does the existence of strong patent laws encourage innovation? And 2)...