Matthew Gentzkow

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Many important economic questions hinge on the extent to which new goods either crowd out or complement consumption of existing products. Recent methods for studying new goods rule out complementarity by assumption, so their applicability to these questions has been limited. I develop a new model that relaxes this restriction, and use it to study(More)
A Bayesian consumer who is uncertain about the quality of an information source will infer that the source is of higher quality when its reports conform to the consumer’s prior expectations. We use this fact to build a model of media bias in which firms slant their reports toward the prior beliefs of their customers in order to build a reputation for(More)
When is it possible for one person to persuade another to change her action? We take a mechanism design approach to this question. Taking preferences and initial beliefs as given, we introduce the notion of a persuasion mechanism: a game between Sender and Receiver defined by an information structure and a message technology. We derive necessary and(More)
I use variation across markets in the timing of television’s introduction to identify its impact on voter turnout. The estimated e¤ect is signi…cantly negative, accounting for between a quarter and a half of the total decline in turnout since the 1950s. It is robust to a range of controls and alternative speci…cations, and interacts intuitively with county(More)
I develop a structural model of newspaper markets to analyze the effects of ownership consolidation. In the model, firms choose both price and quality including the amount of nonadvertising space, the number of reporters, and the number of opinion section staff. I estimate the model using a new data set on newspaper prices and characteristics. I then(More)