Several recent studies have examined the steady-state welfare implications of mortality differentials within unfunded Social Security systems, concluding that these differentials undermine the progressivity of the system and make society worse-off relative to alternative public pension schemes....

This paper uses a two-sector open economy model to examine the dynamic absorption of foreign aid in the presence of both formal and informal production. Calibrating the model to yield a long-run equilibrium consistent with sample averages for 72 aid-recipient developing countries for the period...