Duncan Simester

This week, the New York Attorney General’s office announced that nineteen companies would be fined $350,000 for paying for fake reviews on sites like Yelp. But a study that came out earlier this year says that many fake online reviews, including the most negative ones, are often written by a brand's biggest fans. Bob talks to Duncan Simester, one of the authors of the study and a professor at MIT, about why a brand's fans would leave it bad reviews.