In this paper we test the celebrated `Strength of weak ties' theory of Granovetter (1973). We test two hypotheses on … communities with strong ties within communities and weak ties between, the community of economic researchers has an interlinked …

, formulated in terms of maximization of utility ingeneral, or profits in particular. The standard theory of environmental policy … behavioural assumptions have been most significant for the development ofeconomic valuation theory and environmental policy theory …. The focus here will be onenvironmental policy theory. …

have been, used to find implicit prices, but they also have a much wider use. In theory and in practice, they can be used …