Random Utitly Models (RUMs) are a particularly convenient way of modelling product differentiation. In this paper we demonstrate that they can be used to examine the possibilities of creating quality measures from data on prices and sales volumes. We formulate conditions sufficient for the...

The Internet is rapidly becoming an indispensable resource for political economists. However, little work has been done to develop criteria through which the academic quality of Internet sites can be assessed. This article attempts to fill this lacuna by reviewing Internet sites concerned with...