Abstract We relax the common assumption of homogeneous beliefs in principal-agent relationships with adverse selection. Principals are competitors product market and write contracts also on base an expected aggregate. The model is a version cobweb model. In evolutionary learning set-up, which imitative, principals can have different about distribution agents’ types population. resulting nonline...

Although much depression may be dysfunctional, the capacity to experience normal depressive symptoms in response to certain adverse situations appears to have been shaped by natural selection. If this is true, then different kinds of situations may evoke different patterns of depressive symptoms that are well suited to solving the adaptive challenges specific to each situation. The authors call...

Although much depression may be dysfunctional, the capacity to experience normal depressive symptoms in response to certain adverse situations appears to have been shaped by natural selection. If this is true, then different kinds of situations may evoke different patterns of depressive symptoms that are well suited to solving the adaptive challenges specific to each situation. The authors call...