NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Umit Gurun

University of Texas at Dallas
School of Management
800 W Campbell Rd. SM41
75080 Richardson, TX

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NBER Working Papers and Publications

August 2014Patent Trolls: Evidence from Targeted Firms
with Lauren Cohen, Scott Duke Kominers: w20322
We develop a theoretical model of, and provide the first large-sample evidence on, the behavior and impact of non-practicing entities (NPEs) in the intellectual property space. Our model shows that NPE litigation can reduce infringement and support small inventors. However, the model also shows that as NPEs become effective at bringing frivolous lawsuits, the resulting defense costs inefficiently crowd out some firms that, absent NPEs, would produce welfare-enhancing innovations without engaging in infringement. Our empirical analysis shows that on average, NPEs appear to behave as opportunistic patent trolls. NPEs sue cash-rich firms—a one standard deviation increase in cash holdings roughly doubles a firm's chance of being targeted by NPE litigation. We find moreover that NPEs target cas...
March 2013Advertising Expensive Mortgages
with Gregor Matvos, Amit Seru: w18910
We use a unique dataset that combines information on advertising by subprime lenders and mortgages originated by them from 2002 to 2007 to study the relationship between advertising and the nature of mortgages obtained by consumers. We exploit the richness of our data and measure the relative expensiveness of a given mortgage as the excess rate of a mortgage after accounting for a broad set of borrower, contract, and regional characteristics associated with a given mortgage--less expensive mortgages, all else equal, are better products from the perspective of the consumer. We find a strong positive relationship between the intensity of local advertising and the expensiveness of mortgages extended by lenders within a given region, with the relationship strongest for advertising through news...

Published: Umit G. Gurun & Gregor Matvos & Amit Seru, 2016. "Advertising Expensive Mortgages," Journal of Finance, American Finance Association, vol. 71(5), pages 2371-2416, October. citation courtesy of

August 2012Resident Networks and Firm Trade
with Lauren Cohen, Christopher J. Malloy: w18312
We demonstrate that simply by using the ethnic makeup surrounding a firm's location, we can predict, on average, which trade links are valuable for firms. Using customs and port authority data on the international shipments of all U.S. publicly-traded firms, we show that firms are significantly more likely to trade with countries that have a strong resident population near their firm headquarters. We use the formation of World War II Japanese Internment Camps to isolate exogenous shocks to local ethnic populations, and identify a causal link between local networks and firm trade links. Firms that exploit their local networks (strategic traders) see significant increases in future sales growth and profitability, and outperform other importers and exporters by 5%-7% per year in risk-adjusted...
 
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