Cyril Monnet

A dynamic model of settlement

We investigate the role of settlement in a dynamic model of a payment system where the ability of participants to perform certain welfare-improving transactions is subject to random and unobservable shocks. In the absence of settlement, the full information first-best allocation cannot be supported due to incentive constraints. In contrast, this allocation is supportable if settlement is introduced. This, however, requires that settlement takes place with a sufficiently high frequency.

Endogenous Credit Cycles

This paper studies models of credit with limited commitment and, therefore, endogenous debt limits. There are multiple stationary equilibria plus nonstationary equilibria in which credit conditions change simply because of beliefs. There can be equilibria in which debt limits display deterministic cyclic or chaotic dynamics, as well as stochastic (sunspot) equilibria in which they fluctuate randomly, even though fundamentals are deterministic and time invariant. Examples and applications are discussed. We also consider different mechanisms for determining the terms of trade and compare the setup to other credit models in the literature.

The Welfare Effects of Incentive Schemes

This paper computes the change in welfare associated with the introduction of incentives. Specifically, we calculate by how much the welfare gains of increased output due to incentives outweigh workers disutility from increased effort. We accomplish this by studying the use of incentives by a firm in the check-clearing industry. Using this firms production records, we model and estimate the workers dynamic effort decision problem. We find that the firms incentive scheme has a large effect on productivity, raising it by 14% over the sample period. Using our parameter estimates, we show that the cost of increased effort due to incentives is equal to the dollar value of a 9% rise in productivity. Welfare is measured as the output produced minus the cost of effort, hence the net increase in welfare due to the introduction of the firms bonus plan is 5%. Under a first-best scheme, we find that the net increase in welfare is 6%.

Banking: A Mechanism Design Approach

The authors study banking using the tools of mechanism design, without a priori assumptions about what banks are, who they are, or what they do. Given preferences, technologies, and certain frictions - including limited commitment and imperfect monitoring - they describe the set of incentive feasible allocations and interpret the outcomes in terms of institutions that resemble banks. The bankers in the authors model endogenously accept deposits, and their liabilities help others in making payments. This activity is essential: if it were ruled out the set of feasible allocations would be inferior. The authors discuss how many and which agents play the role of bankers. For example, they show agents who are more connected to the market are better suited for this role since they have more to lose by reneging on obligations. The authors discuss some banking history and compare it with the predictions of their theory.

A search-based model of the interbank money market and monetary policy implementation

We present a search-based model of the interbank money market and monetary policy implementation. Banks are subject to reserve requirements and the central bank tenders reserves. Interbank payments redistribute holdings and banks trade with each other in a decentralized (over-the-counter) market. The central bank provides standing facilities where banks can either deposit surpluses or borrow to cover shortfalls of reserves overnight. The model provides insights on liquidity, trading volume, and rate dispersion in the interbank market – features largely absent from the canonical models in the tradition of Poole (1968) – and fits a number of stylized facts for the Eurosystem observed during the recent period of unconventional monetary policies. Moreover, it provides insights on the implications of different market structures.

The Emergence and Future of Central Counterparties

The authors explain why central counterparties (CCPs) emerged historically. With standardized contracts, it is optimal to insure counterparty risk by clearing those contracts through a CCP that uses novation and mutualization. As netting is not essential for these services, it does not explain why CCPs exist. In over-the-counter markets, as contracts are customized and not fungible, a CCP cannot fully guarantee contract performance. Still, a CCP can help: As bargaining leads to an inefficient allocation of default risk relative to the gains from customization, a transfer scheme is needed. A CCP can implement it by offering partial insurance for customized contracts.

Monetary Policy Implementation Frameworks: A Comparative Analysis

We compare two stylized frameworks for the implementation of monetary policy. The first framework relies only on standing facilities, and the second one relies only on open market operations. We show that the Friedman rule cannot be implemented in the first framework, but can be implemented using the second framework. However, for a given rate of inflation, we show that the first framework unambiguously achieves higher welfare than the second one. We conclude that an optimal system of monetary policy implementation should contain elements of both frameworks. Our results also suggest that any such system should pay interest on both required and excess reserves.

Private Money and Banking Regulation

We show that a competitive banking system is inconsistent with an optimum quantity of private money. Because bankers cannot commit to their promises and the composition of their assets is not publicly observable, a positive franchise value is required to induce the full convertibility of bank liabilities. Under perfect competition, a positive franchise value can be obtained only if the return on bank liabilities is sufficiently low, which imposes a cost on those who hold these liabilities for transaction purposes. If the banking system is monopolistic, then an efficient allocation is incentive-feasible. In this case, the members of the banking system obtain a higher return on assets, making it feasible to pay a sufficiently high return on bank liabilities. Finally, we argue that the regulation of the banking system is required to obtain efficiency.

Credit and the No-Surcharge Rule

A controversial aspect of payment cards has been the “no-surcharge rule.” This rule, which is part of the contract between the card provider and a merchant, states that the merchant cannot charge a customer who pays by card more than a customer who pays by cash. In this paper we consider the design of an optimal card-based payment system when cash is available as an alternative means of payment. We find that a version of the no-surcharge rule emerges as a natural and advantageous feature of such a system.

Private Liquidity and Banking Regulation

We show that the regulation of bank lending practices is necessary for the optimal provision of private liquidity. In an environment in which bankers cannot commit to repay their creditors, we show that neither an unregulated banking system nor narrow banking can provide the socially efficient amount of liquidity. If the bankers provided such an amount, then they would prefer to default on their liabilities. We show that a regulation that increases the value of the banking sector’s assets (e.g., by limiting competition in bank lending) will mitigate the commitment problem. If the value of the bank charter is made sufficiently large, then it is possible to implement an efficient allocation. Thus, the creation of a valuable bank charter is necessary for efficiency.