We modify the Diamond-Dybvig [3] model studied in Green and Lin [5] to incorporate a self-interested banker who has a private record-keeping technology. A public record-keeping device does not exist. We find that there is a trade-off between sophisticated contracts that possess relatively good...

We find that in order to have circulating counterfeit notes as part of the optimal mechanism, there must be heterogeneity of opportunities to create and circulate counterfeit among agents. When such heterogeneity exists, we find that counterfeiting creates distortions at both the intensive and...