The object of this paper is to show some examples of economies in which singular equilibria occur as a consequence of utility functions and where this equilibria play a crucial rolle to understand the behavior of the economy as a system. An economy will be called singular if little changes in...

Las restricciones impuestas por organismos reguladores al diseño de carteras de administradoras de fondos de retiro, pretenden orientar el comportamiento de las administradoras, no obstante estas restricciones conllevan pérdida de bienestar por parte de los ahorristas. En el presente trabajo...

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...