Developing a model with a switching mechanism, we show how complex dynamics can be generated even though heterogeneity arises among agents with the same trading rules (fundamentalists). We assume that there are two experts which are imitated by other operators. We show that (i) market...

In Tunisia, the apples occupy a significant place on the sector of perennial crops. This cropcovered expanded areas during the eighties following an extensive use of efficient waterequipments. However, significant seasonal and annual variation of fruit supplies in thedomestic market were...

Agricultural price volatility is "bad". But where does it come from? Remedies are completely different for "endogenous" or "exogenous" fluctuations. The recent crisis seems to indicate that exogenous remedies have been applied to endogenous fluctuations.