This study assesses whether the undertaken reforms in the microfinance industry in the West African Economic and Monetary Union (WAEMU) have promoted sustainability or outreach. To this purpose we use a data envelopment analysis (DEA) to measure the social efficiency on the one hand and the...

This note provides an intuitive and simple proof of the existence of equilibrium in an incomplete ffnancial economy with numeraire assets, when the preferences are represented by concave, strictly increasing functions..

We consider a model with an finite number of states of nature where short sells are allowed.

We address the fundamental issues of existence and efficiency of an equilibrium in a Ramsey model with many agents, where agents have heterogenous discounting, elastic labor supply and face borrowing con- straints. The existence of rational bubbles is also tackled. In the first part, we prove...

We consider a model with an inffnite number of states of nature, von Neumann - Morgenstern utilities, where agents have different probabil- ity beliefs and where short sells are allowed. We show that no-arbitrage conditions, deffned for ffnite dimensional asset markets models, are not sufficient...

We address the issues of existence of Ramsey equilibrium under bor- rowing constraints and occurrence of rational bubbles. First, we consider a time-truncated economy. Since the feasible allo- cations sets of our economy are uniformly bounded, we prove that there exists an equilibrium in a...

We consider a general equilibrium model with heterogeneous agents, borrowing constraints, and exogenous labor supply. First, the existence of intertemporal equi- librium is proved even if the aggregate capitals are not uniformly bounded above and the production functions are not time invariant....

This paper examines the equilibrium of financial portfolios under insurance

In both estimation and calibration studies, the notion of ergodicity plays a fundamental role, permitting time series averages to be regarded as approximations to population means. As it turns out, many economic models routinely used for quantitative modeling do not satisfy the classical...

This article reconsiders the theory of existence of efficient allocations and equilibria when consumption sets are unbounded below under the assumption that agents have incomplete preferences. It is motivated by an example in the theory of assets with short-selling where there is risk and...