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- May–June 2023
- Article
Which Firms Gain from Digital Advertising? Evidence from a Field Experiment
By: Weijia Dai, Hyunjin Kim and Michael Luca
Measuring the returns of advertising opportunities continues to be a challenge for many
businesses. We design and run a field experiment in collaboration with Yelp across 18,294
firms in the restaurant industry to understand which types of businesses gain more from...
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Dai, Weijia, Hyunjin Kim, and Michael Luca. "Which Firms Gain from Digital Advertising? Evidence from a Field Experiment." Marketing Science 42, no. 3 (May–June 2023): 429–439.
- 2022
- Working Paper
Consumer Reviews and Regulation: Evidence from NYC Restaurants
By: Chiara Farronato and Georgios Zervas
We investigate the informativeness of hygiene signals in online reviews, and their effect on consumer choice and restaurant hygiene. We first extract signals of hygiene from Yelp. Among all dimensions that regulators monitor through mandated restaurant inspections, we...
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Keywords:
Restaurants;
Reviews;
Hygiene;
Yelp;
Regulation;
Food;
Governing Rules, Regulations, and Reforms;
Consumer Behavior
Farronato, Chiara, and Georgios Zervas. "Consumer Reviews and Regulation: Evidence from NYC Restaurants." NBER Working Paper Series, No. 29715, February 2022.
- October 2020 (Revised August 2022)
- Case
Experimentation at Yelp
By: Iavor I Bojinov and Karim R. Lakhani
Bojinov, Iavor I., and Karim R. Lakhani. "Experimentation at Yelp." Harvard Business School Case 621-064, October 2020. (Revised August 2022.)
- May 2020
- Article
Digitizing Disclosure: The Case of Restaurant Hygiene Scores
By: Weijia (Daisy) Dai and Michael Luca
Collaborating with Yelp and the city of San Francisco, we revisit a canonical example of quality disclosure by evaluating and helping to redesign the posting of restaurant hygiene scores on Yelp.com. We implement a two-stage intervention that separately identifies...
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Keywords:
Corporate Disclosure;
Consumer Behavior;
Knowledge Dissemination;
Food and Beverage Industry
Dai, Weijia (Daisy), and Michael Luca. "Digitizing Disclosure: The Case of Restaurant Hygiene Scores." American Economic Journal: Microeconomics 12, no. 2 (May 2020): 41–59.
- October 14, 2019
- Article
Designing Better Online Review Systems
By: Geoff Donaker, Hyunjin Kim and Michael Luca
Online reviews are transforming the way consumers choose products and services of all sorts. We turn to TripAdvisor to plan a vacation, Zocdoc to find a doctor, and Yelp to choose a new restaurant. Reviews can create value for buyers and sellers alike, but only if they...
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Donaker, Geoff, Hyunjin Kim, and Michael Luca. "Designing Better Online Review Systems." Harvard Business Review 97, no. 6 (November–December 2019): 122–129.
- Article
Product Quality and Entering Through Tying: Experimental Evidence
By: Hyunjin Kim and Michael Luca
Dominant platform businesses often develop products in adjacent markets to complement their core business. One common approach used to gain traction in these adjacent markets has been to pursue a tying strategy. For example, Microsoft pre-installed Internet Explorer...
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Keywords:
Tying;
Platform Strategy;
Google;
Product;
Quality;
Digital Platforms;
Strategy;
Market Entry and Exit
Kim, Hyunjin, and Michael Luca. "Product Quality and Entering Through Tying: Experimental Evidence." Management Science 65, no. 2 (February 2019): 596–603.
- 2018
- Working Paper
Product Quality and Entering Through Tying: Experimental Evidence
By: Michael Luca
Dominant platform businesses often develop products in adjacent markets to complement their core business. One common approach used to gain traction in these adjacent markets has been to pursue a tying strategy. For example, Microsoft pre-installed Internet Explorer...
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Keywords:
Market Entry and Exit;
Digital Platforms;
Competitive Strategy;
Product Marketing;
Quality
Kim, Hyunjin, and Michael Luca. "Product Quality and Entering Through Tying: Experimental Evidence." Harvard Business School Working Paper, No. 19-045, October 2018. (Revised December 2018. Forthcoming in Management Science.)
- September 2018
- Article
Aggregation of Consumer Ratings: An Application to Yelp.com
By: Weijia Dai, Ginger Jin, Jungmin Lee and Michael Luca
Because consumer reviews leverage the wisdom of the crowd, the way in which they are aggregated is a central decision faced by platforms. We explore this "rating aggregation problem" and offer a structural approach to solving it, allowing for (1) reviewers to vary in...
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Keywords:
User Generated Content;
Crowdsourcing;
Yelp;
Social and Collaborative Networks;
Information;
Internet and the Web;
Learning;
Mathematical Methods;
E-commerce
Dai, Weijia, Ginger Jin, Jungmin Lee, and Michael Luca. "Aggregation of Consumer Ratings: An Application to Yelp.com." Quantitative Marketing and Economics 16, no. 3 (September 2018): 289–339.
- 2018
- Working Paper
Measuring Gentrification: Using Yelp Data to Quantify Neighborhood Change
By: Edward L. Glaeser, Hyunjin Kim and Michael Luca
We demonstrate that data from digital platforms such as Yelp have the potential to improve our understanding of gentrification, both by providing data in close to real time (i.e., nowcasting and forecasting) and by providing additional context about how the local...
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Keywords:
Geographic Location;
Local Range;
Transition;
Analytics and Data Science;
Measurement and Metrics;
Forecasting and Prediction
Glaeser, Edward L., Hyunjin Kim, and Michael Luca. "Measuring Gentrification: Using Yelp Data to Quantify Neighborhood Change." NBER Working Paper Series, No. 24952, August 2018.
- May 2018
- Article
Nowcasting Gentrification: Using Yelp Data to Quantify Neighborhood Change
By: Edward L. Glaeser, Hyunjin Kim and Michael Luca
Data from digital platforms have the potential to improve our understanding of gentrification and enable new measures of how neighborhoods change in close to real time. Combining data on businesses from Yelp with data on gentrification from the Census, Federal Housing...
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Keywords:
Forecasting Models;
Simulation Methods;
Regional Economic Activity: Growth, Development, Environmental Issues, And Changes;
Geographic Location;
Local Range;
Transition;
Analytics and Data Science;
Measurement and Metrics;
Economic Growth;
Forecasting and Prediction
Glaeser, Edward L., Hyunjin Kim, and Michael Luca. "Nowcasting Gentrification: Using Yelp Data to Quantify Neighborhood Change." AEA Papers and Proceedings 108 (May 2018): 77–82.
- March 2018 (Revised February 2023)
- Teaching Note
Managing Diversity and Inclusion at Yelp
By: Michael Luca, Joshua Schwartzstein and Gauri Subramani
Teaching Note for HBS No. 918-009.
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- 2017
- Working Paper
Nowcasting the Local Economy: Using Yelp Data to Measure Economic Activity
By: Edward L. Glaeser, Hyunjin Kim and Michael Luca
Can new data sources from online platforms help to measure local economic activity? Government datasets from agencies such as the U.S. Census Bureau provide the standard measures of economic activity at the local level. However, these statistics typically appear only...
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Glaeser, Edward L., Hyunjin Kim, and Michael Luca. "Nowcasting the Local Economy: Using Yelp Data to Measure Economic Activity." Harvard Business School Working Paper, No. 18-022, September 2017. (Revised October 2017.)
- September 2017 (Revised February 2023)
- Supplement
Managing Diversity and Inclusion at Yelp (B)
By: Michael Luca, Joshua Schwartzstein and Gauri Subramani
Supplements the (A) case.
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Luca, Michael, Joshua Schwartzstein, and Gauri Subramani. "Managing Diversity and Inclusion at Yelp (B)." Harvard Business School Supplement 918-012, September 2017. (Revised February 2023.)
- August 2017 (Revised February 2023)
- Case
Managing Diversity and Inclusion at Yelp
By: Michael Luca, Joshua Schwartzstein and Gauri Subramani
This case explores the industry-wide lack of employee diversity in the technology sector and Yelp’s decision to take a leadership position in identifying strategies to increase diversity. The goal of the case is to provide an opportunity for students to develop a...
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Keywords:
Diversity;
Employees;
Leading Change;
Strategy;
Organizational Culture;
Technology Industry
Luca, Michael, Joshua Schwartzstein, and Gauri Subramani. "Managing Diversity and Inclusion at Yelp." Harvard Business School Case 918-009, August 2017. (Revised February 2023.)
- December 2016
- Article
Fake It Till You Make It: Reputation, Competition, and Yelp Review Fraud
By: Michael Luca and Georgios Zervas
Consumer reviews are now part of everyday decision making. Yet, the credibility of these reviews is fundamentally undermined when businesses commit review fraud, creating fake reviews for themselves or their competitors. We investigate the economic incentives to commit...
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Luca, Michael, and Georgios Zervas. "Fake It Till You Make It: Reputation, Competition, and Yelp Review Fraud." Management Science 62, no. 12 (December 2016): 3412–3427.
- July 2016
- Teaching Note
Launching Yelp Reservations
By: Michael Luca, Kevin Mohan and Patrick Rooney
This teaching note accompanies "Launching Yelp Reservations (A) and (B)," which present a multi-party negotiation among Yelp, current partner OpenTable, and two startups in the online restaurant reservation industry.
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- March 2016
- Supplement
Advertising Experiments at RestaurantGrades
By: Weijia Dai, Hyunjin Kim and Michael Luca
This exercise provides students with a data set consisting of results from a hypothetical experiment, and asks students to make recommendations based on the data. Through this process, the exercise teaches students to analyze, design, and interpret experiments. The...
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- 2016
- Chapter
User-Generated Content and Social Media
By: Michael Luca
This paper documents what economists have learned about user-generated content (UGC) and social media. A growing body of evidence suggests that UGC on platforms ranging from Yelp to Facebook has a large causal impact on economic and social outcomes ranging from...
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Keywords:
User-generated Content;
Crowdsourcing;
Design Economics;
Internet and the Web;
Marketing;
Economics;
Media;
Social Media
Luca, Michael. "User-Generated Content and Social Media." Chap. 12 in Handbook of Media Economics. Vol. 1B, edited by Simon Anderson, Joel Waldfogel, and David Strömberg. North-Holland Publishing Company, 2016.
- August 2015
- Supplement
Launching Yelp Reservations (B)
By: Michael Luca, Kevin Mohan and Patrick Rooney
Luca, Michael, Kevin Mohan, and Patrick Rooney. "Launching Yelp Reservations (B)." Harvard Business School Supplement 916-004, August 2015.