A powerful test of Varian's (1982) generalised axiom of revealed preference (GARP) with two goods requires the consumer's budget line to pass through two demand vectors revealed as chosen given other budget sets. In an experiment using this idea, each of 41 student subjects faced a series of 16...

Hartwick’s rule of investigating resource rents in an economy with producible capital and exhaustible resources becomes, in a general model of heterogeneous stocks, a rule whereby the total value of net investment (resource depletion counting negative) is equal to zero. It is shown that...