prices and advertising tariffs. We build on the work of Gabszewicz, Laussel and Sonnac (2001, 2002), whose model we take as …), cover prices are positive and the minimal differentiation outcome does not depend on the size of the advertising market. We … to cooperate in setting cover prices and advertising tariffs but not the editorial line …

affected the incidence of HIV. Using a natural experiment setup, we identify the effects of Craigslist's entry on HIV trends by …'s entry leads to a 19.8 percent increase in HIV cases, which maps out to an average of 158.7 cases for a state in a year. The …. The increases in HIV cases as a result of Craigslist entry are estimated to impose treatment costs of over $118 million …