Economic valuation is controversial largely because its purpose has not been clearly conveyed to non-economists. The purpose of valuation of the natural world is to elicit measures of human preferences for, or against, environmental change. As a procedure, it thus faces two immediate...

In this paper we desribe a general equilibrium model of the world economy, designed to simulate the effect of a liberalization of world food trade. Our model owes much to Tyers (1985) partial equilibrium model which covered trade between 30 countries in 7 agricultural commodities. It also...

The search for sustainability indicators should be guided by a theory of sustainable development (SD). In this paper we investigate two such theoretical frameworks and the indicators that they suggest. Indicators associated with weak sustainability are characterized by aggregative indicators...