This paper sheds light on a poorly understood phenomenon in microfinance which is often referred to as "mission drift": A tendency reviewd by numerous microfinance institutions to extend larger average loan sizes in the process of scaling-up. . We argue that this phenomenon is not driven by...

Levy and Roll (Review of Financial Studies, 2010) have recently revived the debate related to the market portfolio's efficiency suggesting that it may be mean-variance efficient after all. This paper develops an alternative test of portfolio mean-variance efficiency based on the realistic...

This paper proposes a principal–agent model of labour market discrimination. In this model, the firm manager is a taste-based discriminator and has to make unobservable hiring decisions that determine the shareholder's profits, because workers differ in skill. The model shows that...

A summary of this paper, by Deborah Kidd, has been published in CFA Digest, February 2011, vol 41, N°1