In July, an Uber driver we’ll call Dave—his name has been changed here to protect his identity—picked up a fare in a trendy neighborhood of a major U.S. metropolitan area. It was rush hour and surge pricing was in effect due to increased demand, meaning that Dave would be paid almost twice the regular fare.

Even though the trip was only five miles, it lasted for more than half an hour because his passengers scheduled a stop at Taco Bell for dinner. Dave knew sitting at the restaurant waiting for his fares to get a Doritos Cheesy Gordita Crunch or whatever would cost him money; he was earning only 21 cents a minute when the meter was running, compared to 60 cents per mile. With surge pricing in effect, it would be far more lucrative to keep moving and picking up new fares than sitting in a parking lot.