This paper surveys the main contributions of Amartya Sen in the fields of social choice theory, income distribution, and measurement of poverty. His empirical studies on famine and his discussion of the fundamental themes of rational choice are also commented on. A recurring theme in Sen's work...

We analize the regulation established by the Banco de México in 2010 to commissions by interbank transactions at ATMs. Under a space model with a duopoly, we endogenize ATM deployment, account fees and ATM fees. We show that the commissions by interbank transactions remain unchanged. The...

The restrictions imposed by the regulatory authorities on the composition of retirement-fund portfolios are aimed at avoiding opportunistic behavior on the part of retirement-fund managers. However, these restrictions reduce the welfare of the shareholders of such funds. In this paper, the...

For economies with infinitely many goods, with two different approaches we obtain sufficient conditions for uniqueness of competitive equilibrium. In the second approach we prove that the Mitjushim-Polterovich conditions is a sufficient condition for uniqueness of equilibrium when the...