Climate change, nuclear proliferation, and the threat of a global pandemic have the potential to impact each of our lives. Preventing these threats poses a serious global challenge, but ignoring them could have disastrous consequences. How do we engineer institutions to change incentives so that...

Environmental problems like global climate change and stratospheric ozone depletion can only be remedied if states cooperate with one another. But sovereign states usually care only about their own interests. So states must somehow restructure the incentives to make cooperation pay. This is what...

Should polio be eradicated worldwide, countries must decide whether to continue to vaccinate with the live-attenuated vaccine, to continue to vaccinate with the alternative, killed vaccine, or to cease vaccinating. To reap a dividend from polio eradication, countries must choose the last option,...

The essential problem with the Kyoto approach is that it provides poor incentives for participation and compliance: The minimum participation clause is set at such a low level that the agreement can enter into force while limiting the emission ofless than a third ofthe global total. The...

Why did the world succeed in eradicating smallpox? Though eradication is a global public good, theory suggests that it should not have been vulnerable to free riding. Some countries, however, lacked the capacity to eliminate smallpox. Success thus depended on the other countries providing...