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...