In an environmental economics context increasing marginal damage costs are usually assumed, and a methodology for calculating a sustainability index in accordance with this assumption is presented. The aggregate index is constructed from an n-element vector including the values of the (n) subset...

In recent years the Present Value (PV) model has been used extensively to interpret the behaviour of farmland prices. In this paper the rational expectations version of the PV-model used by Tegene and Kuchler (1993) to test for bubbles is examined using long time-series data for land prices and...