A simple bieconomic model (the Gordon-SChaefer model) is estimated for three species of tuna in the Eastern Tropical Atlantic. The model conformed well to the data and afforded estimates of maximum sustainable yield, bioeconomic and open access equilibria. Strong marginal stock effects were...

Food-for-work (FFW) programs are commonly used both for short-term relief and long-term development purposes. In this paper we assess the potential of FFW programs to reduce poverty and promote sustainable land use in the longer run. There is a danger that such programs distort labor allocation...

For decades, rapid urban expansion has led to concerns over the loss of cultivated land in rural China. Less well known is the fact that development of newly cultivated land has in fact consistently exceeded land conversion from 1999-2006. This paper provides an analytical model that makes sense...