He continued to work on development (with Little), taxation (often with Diamond), growth (with Stern, Dixit and Hammond), principal/agent problems, and welfare economics.

• 他完成了发展经济学(与利特尔合作)、税收理论(与戴芒德合作)、增长理论(与斯特恩,迪西特和汉芒德合作)、委讬/代理问题和福利经济学的著作和文章。