MIT Sloan School of Management
E62 Room 412
30 Memorial Dr.
Cambridge, MA 02142
NBER Working Papers and Publications
|February 2018||The Welfare Effects of Peer Entry in the Accommodation Market: The Case of Airbnb|
with Chiara Farronato: w24361
We study the effects of enabling peer supply through Airbnb in the accommodation industry. We present a model of competition between flexible and dedicated sellers - peer hosts and hotels - who provide differentiated products. We estimate this model using data from major US cities and quantify the welfare effects of Airbnb on travelers, hosts, and hotels. The welfare gains are concentrated in locations (New York) and times (New Years Eve) when hotels are capacity constrained. This occurs because peer hosts are responsive to market conditions, expand supply as hotels fill up, and keep hotel prices down as a result.
|November 2011||The Welfare Economics of Default Options in 401(k) Plans|
with B. Douglas Bernheim, Igor Popov: w17587
Default contribution rates for 401(k) pension plans powerfully influence workers’ choices. Potential causes include opt-out costs, procrastination, inattention, and psychological anchoring. We examine the welfare implications of defaults under each of these theories. We show how the optimal default, the magnitude of the welfare effects, and the degree of normative ambiguity depend on the behavioral model, the scope of the choice domain deemed welfare-relevant, the use of penalties for passive choice, and other 401(k) plan features. Depending on which theory and welfare perspective one adopts, virtually any default contribution rate may be optimal. Still, our analysis provides reasonably robust justifications for setting the default either at the highest contribution rate matched by the emp...
Published: B. Douglas Bernheim & Andrey Fradkin & Igor Popov, 2015. "The Welfare Economics of Default Options in 401(k) Plans," American Economic Review, vol 105(9), pages 2798-2837. citation courtesy of