Product Lines and Price Discrimination in Markets with Information Frictions

A well-known principle in economics is that firms differentiate their product offerings in order to relax competition. However, in this paper we show that information frictions can invalidate this principle. We build a duopolistic competition model of second-degree price discrimination with information frictions in which (i) an equilibrium always exists with overlapping product qualities, whereas (ii) an equilibrium with nonoverlapping product qualities exists only if both information frictions and the cost of providing high quality are sufficiently small. As a consequence, reasons other than an attempt to soften competition should explain why firms in some cases carry nonoverlapping product lines. This paper was accepted by Matthew Shum, marketing.

Gang rule: Understanding and Countering Criminal Governance

Gangs govern millions worldwide. Why rule? and how do they respond to states? Many argue that criminal rule provides protection when states do not, and that increasing state services could crowd gangs out. We began by interviewing leaders from 30 criminal groups in Medellín. The conventional view overlooks gangs’ indirect incentives to rule: governing keeps police out and fosters civilian loyalty, protecting other business lines. We present a model of duopolistic competition with returns to loyalty and show under what conditions exogenous changes to state protection causes gangs to change governance levels. We run the first gang-level field experiment, intensifying city governance in select neighborhoods for two years. We see no decrease in gang rule. We also examine a quasi-experiment. New borders in Medellín created discontinuities in access to government services for 30 years. Gangs responded to greater state rule by governing more. We propose alternatives for countering criminal governance.