We analyze price and quality competition in a vertically differentiated duopoly in which consumers have a preference for variety. The variety-seeking preferences are a consequence of diminishing marginal utility for repeated consumption experiences of the same product. We find that...

This paper demonstrates that, under a set of weak assumptions, increased product differentiation will make it more difficult to sustain collusion when it is costly either to coordinate or to maintain collusion. These results contrast with the previous theoretical literature, which shows that, in...