Margin Squeeze in a Regulatory Environment: An Application to Differentiated Product Markets

Abstract

This paper analyses the effects of banning pricing policies that lead to margin squeezes when the upstream good is imperfectly regulated. The analysis relies on a modelling with a vertically integrated upstream monopolist that faces competition by an unintegrated downstream competitor. It shows that for differentiated goods in the downstream market, a margin squeeze can be observed as the competitive outcome rather than exclusionary conduct. If upstream market regulation is non-constraining, a margin squeeze ban induces the vertically integrated firm to increase its own downstream price (this is, a price umbrella), but also to review its upstream pricing behavior and reduce the upstream price charged to the retail competitor. This decreasing rivals' costs effect (DRC-effect) allows the integrated firm to maximise its profits given the constraint on the downstream price, and allows the downstream competitor to set a lower retail price. However, when constraining upstream regulation and a ban are implemented jointly, the DRC-effect vanishes and downstream prices may to rise, leading to a decrease of consumer surplus. This analysis tends to back up the American way of handling margin squeezes in a regulated environment.