People usually look to Yelp to find a decent pizza place, scope out a hairdresser, or read impassioned customer reviews of yarn stores. Now, Yelp is promising to provide a different service: help aspiring entrepreneurs decide where to open small businesses. The company’s “Local Economic Outlook” report, released last week, takes a look at the economic health of 50 cities across the United States, using the company’s user-generated data for the third quarter of 2017.

The report ranks cities on an …