Michael Luca
6 Results
- 26 Apr 2012
- Working Papers
What Makes a Critic Tick? Connected Authors and the Determinants of Book Reviews
The professional critic has long been heralded as the gold standard for evaluating products and services such as books, movies, and restaurants. Analyzing hundreds of book reviews from 40 different newspapers and magazines, Professor Michael Luca and coauthors Loretti Dobrescu and Alberto Motta investigate the determinants of professional reviews and then compare these to consumer reviews from Amazon.com. Read More
- 04 Oct 2011
- Working Papers
Reviews, Reputation, and Revenue: The Case of Yelp.com
In just six years, Yelp.com has managed to crowdsource 20 million reviews of restaurants and other services by creating and leveraging an impressive social network of people who enjoy writing reviews. But can a bunch of amateur opinionators working for free really transform the restaurant industry, where heavily marketed chains and highly regarded professional critics have long had a stronghold? To answer this question, HBS professor Michael Luca combined Yelp reviews with revenues for every restaurant that operated in Seattle, WA at any point between 2003 and 2009. Applying a new method to tease out the causal effect of reviews (separate from the effect of underlying quality), the study shows that a one-star increase on Yelp leads to a 5 to 9 percent increase in revenue. Yet Yelp doesn't work for all restaurants. Chain restaurants —which already spend heavily on branding —are unaffected by changes in their Yelp ratings. This suggests that consumer reviews present a new way of learning in the Internet age, and are fast becoming a substitute for traditional forms of reputation. Read More
- 27 Sep 2011
- Working Papers
Salience in Quality Disclosure: Evidence from the U.S. News College Rankings
Why are the U.S. News and World Report College Rankings so influential? According to this paper by Michael Luca and Jonathan Smith, it's at least in part because U.S. News makes the information so simple. While earlier college guides had already provided useful information about schools, U.S. News did the work of aggregating the information into an easy-to-use ranking, making it more salient for prospective students. The authors show that these rankings matter in a big way: a one-rank improvement leads to a 0.9 percent increase in applicants. However, students tend to ignore the underlying details even though these details carry more information than the overall rank. Read More