This paper is organized as follows. In order to explain the basic idea of 4th best pricing more fully the following Section 2 will sketch and discuss the above mentioned Laffont model, where it is shown that under certain conditions a uniform tariff may be preferable to an optional tariff...

It is often contended that there is a sharp conflict between the economist's and the ecologist's approach to the question of sustainability. This paper takes the opposite view. The paper attempts to show that both views can be formulated in a common analytical framework and that carried to its...