The standard monopoly pricing problem is re-considered when the buyer’s type (e.g. age, income, experience) can be credibly disclosed at some cost. In the optimal sales mechanism with costly disclosure, the seller posts a “sticker price” available to any buyer, as well as a schedule of discounts available to those who disclose certain types. Unambiguous welfare implications are available in the...

Consider a durable goods producer that has the option of monopolizing an aftermarket such as repair for its own product. An important question is whether such monopolization reduces welfare? We show that the anwer to this question is frequently no. In particular, we explore three models that illustrate various ways in which aftermarket monopolization can reduce inefficiencies and thus increase ...

In recent years, progressive public intellectuals and prominent scholars have asserted that monopoly power lies at the root of wealth inequality and that increases in antitrust enforcement are necessary to stem its rising tide. This claim is misguided. Exercises of market power have complex, crosscutting effects that undermine the generality of the monopoly regressivity claim. Contrary to what ...

We analyze oligopolistic competition in a multi-period dynamic setting for goods with network effects. Two or more infinitely-lived firms produce incompatible products differentiated in their inherent quality. Consumers live for a single period and receive the network effect of the previous period’s sales. We show existence and characterize Markov perfect equilibria that are unique given market...

We show information technology (in short IT) caused rising monopoly power and rising income and wealth inequality since the 1970's. Our reasoning proceeds in four steps. step 1 examines surplus wealth the difference between firm’s wealth (equity and debt) and capital employed. Surplus wealth rose from -$0.59 Trillion in 1974 to $24 Trillion in 2015 which is 82% of total stock market value, refl...

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