Aggregate monetary and quantitative effects of supply-management policies on the fresh winter tomato industry participants were estimated. A computer simulation model was constructed with an interseasonal phase and an intraseasonal phase. It simulates the longrun effects of various supply-management policies that could be applied to tomatoes grown in Florida and tomatoes imported from Mexico in order to stabilize weekly f.o.b. prices at prespecified levels. The effects were higher, more stable retail prices and slightly smaller quantities consumed.