We present a restriction on the domain of individual preferences that is both necessary and sufficient for the existence of a social choice rule that is continuous, anonymous, and respects unanimity. The restriction is that the space of preferences be contractible. Contractibility admits a...

The present acceleration of environmental destruction can be linked to the economic trading strategies that came into vogue after World War II. The theory of comparative advantages of trade, which recommends that developing countries emphasize resource exports and exports of labor-intensive...

Global modeling has evolved remarkably in the last two decades. Such evolution led it to perform today's role as an experimental laboratory for the social sciences, and particularly for applications to policy planning. Two of the most interesting applications to policy are to resource economics...

Today's rapid and profound international evolution requires an update of the development agenda. As East-West relations alter radically and forge history, new trends in global capital markets; telecommunications and new technologies erode inexorably the old structures and alter permanently the...

We prove the existence of an optimal growth path in an economy where goods that are not consumed are wither invested in next period or in R&D with overall non-convex production possibilities, ising results of non-linear functional analysis in weighted Lp spaces of Chichilnisky (Journal of...