Thanks to anti-retroviral therapies, people living with HIV in developing countries can now have a near-normal life at a cost of a few hundred dollars per year. We postulate that given this newly low cost of maintaining lives, there is a moral duty to rescue those who are infected. The core of...

Geoengineering, i.e. the use of artificial techniques aiming at cooling the planet, is increasingly considered as a realistic alternative to emission mitigation. Several methods are promising for their capacity to quickly halt global warming at a moderate cost. Such cheap technologies might be...

Geoengineering, i.e. the use of artificial techniques aiming at cooling the planet, is increasingly considered as a realistic alternative to emission mitigation. Several methods are promising for their capacity to quickly halt global warming at a moderate cost. Such cheap technologies might be...

Among non-specialists, the estimates of the HIV/AIDS transmission rate are generally upwardly biased. This overestimation may be perceived as a godsend, as it increases the incentives to have protected sexual relationships. However, a pernicious effect may counterbalance this positive effect....

Simple welfare indices such as mean income are ubiquitous but not distribution sensitive. In contrast, existing distribution sensitive welfare indices are rarely used, often because they are difficult to explain and/or lack intuitive units. This paper proposes a simple new distribution sensitive...

Will the fast expansion of cash-based programming in developing countries increase international migration? Theoretically, cash transfers may favor international migration by relaxing liquidity, credit, and risk constraints. But transfers, especially those conditional upon staying at home, may...