NOTE ON THE WELFARE EFFECT OF SECOND‐BEST POLICIES IN A NETWORK INDUSTRY: A MONOPOLY CASE

We show that the welfare effect of second‐best policies such as a subsidy/tax and quality regulation in the case of a monopoly in a network industry depends on the strength of network effects. That is, focusing on the case in which the network effect is smaller (larger) than the marginal cost of production for the small (large) network effect, it is demonstrated that in the case of a small (large) network effect, an output and a quality‐improving subsidy (tax) policy are socially optimal, and a government should commit to a minimum (maximum) quality standard.