SALT LAKE CITY — It is often the first place people turn to when trying to find a new restaurant, the online review website Yelp. “Every business is on Yelp. They have no way to opt out,” said Georgios Zervas, an assistant professor at Boston University. Zervas has studied the economics behind Yelp and the influence it has both positive and negative on businesses. Citing fellow researchers, Zervas explained to a class of college students the economic impact Yelp reviews…
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