In this paper, we review the literature on vertical product differentiation in connection with its impact on market structure. Two types of vertical differentiation are identified according to whether consumer unanimity over product ranking is maintained at prices reflecting average cost...

In this paper, we assume that contributing to a charitable organisation (CO) brings some “joy of giving” (or “warm glow”) only if the organisation’s ideological values are close to those of the donor. We also assume that creating a CO entails set-up costs. Thus more CO generates more...

This paper reviews in a non-technical presentation some of the theoretical foundations of the Porter Hypothesis that argues that strict environmental regulations may increase the profits of industries that have to respect them. After a short presentation of the hypothesis, some of the arguments...