Estimating diversion ratios from market shares using transition matrices
PALESTRANTE:
Eduardo Pontual Ribeiro
Professor Titular do Instituto de Economia/UFRJ
RESUMO: Understanding the closeness of competition between competitors is of interest for market analysts and antitrust practitioners. It may be summarized by the diversion ratio. We present an empirical method to estimate diversion ratios from market share data using transition matrix estimates. This method can help understand the closeness of competition, going beyond restrictive market-share-based diversion ratios with little data requirements. Two datasets illustrate the method: cross-sectional mobile telecom services in Brazil, and time series of online travel agencies in Russia. The method is also used to calculate counterfactuals and estimate the effect of international online travel agency platforms’ exit from the Russian domestic market in March 2022.. Paper co-authored with Svetlana Golovanova.
DATA: 22/06/2026
HORA: 16h40
SALA: 203
Os seminários ocorrerão às segundas-feiras na sala 203. A sala tem que ser liberada até 18:15, pois à noite ela é utilizada pelo curso noturno.
Os alunos de mestrado e doutorado em tempo integral têm que obter uma frequência mínima de 75% nos seminários e os demais uma frequência mínima de 50%.
