Theory: Markets and the tyranny of the majority; Are "lumpy" markets a problem?; Empirical evidence: Who benefits whom in practice; Who benefits whom in the neighborhood; Preference minorities as citizens and consumers -- Market solutions and their limits: Market enlargement and consumer...

Theory predicts that in markets with increasing returns, the number of differentiated products and resulting consumer satisfaction grow in market size. We document this phenomenon across 246 US radio markets. By a mechanism that we term 'preference externalities', an increase in the size of the...