' Preface -- Part I: Patents -- Chapter 1. Rent Dissipation in R&D Races -- Abstract -- 1. Introduction -- 2. Model -- 3 … -- Acknowledgements -- Appendix -- References -- Chapter 2. Innovation, Duplication, and the Contract Theory of Patents -- Abstract -- 1 …. Introduction -- 2. The model -- 3. Benchmark: no duplication -- 4. Duplication with no licensing -- 5. Preemptive licensing -- 6 …