وام دهی گروهی با کژ گزینی

We focus on adverse selection as a foundation of group lending. In a simple static model we show that there is no collateral effect if borrowers do not know each other. If the borrowers know each other, group lending implements efficient lending. However, it is not robust to collusive behavior, when transfers are allowed between colluding partners. Finally, we characterize the optimal collusion-proof group contract.