The welfare effects of endogenous quality choice in cable television markets

We measure the welfare consequences of endogenous quality choice in imperfectly competitive markets. We introduce the concept of a "quality markup" and measure the relative welfare consequences of market power over price and quality. For U.S. paid-television markets during 1997-2006, we find that not only are cable monopolists' prices 33% to 74% higher than marginal costs, but qualities are also 23% to 55% higher than socially optimal and the welfare costs of each are similar in magnitude. Such evidence for "quality inflation" by monopolists is at odds with classic results in the literature.