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...

A control model of the U.S. dairy sector was constructed to determine optimal policy when bovine somatotropin is released. Social welfare defined as consumer plus producer surplus minus adjustment and net government costs was maximized. Control variables were the milk support price and...