Economists at the University of California, Los Angeles used from Uber to study the effects of switching from a fixed weekly pay schedule to a system that allows on-demand withdrawals.

Uber and Lyft drivers protested at Hartsfield-Jackson Atlanta International Airport Dec. 23, demanding higher pay and expressing dissatisfaction with the current compensation structure.

Uber has argued that the city’s drivers are compensated fairly and that their pay should in fact be lowered. The company released a study last month that found that after driving-related ...

For Rafael, the 90-plus-hour-a-week driver in Boston, pay has dropped so much, he said, that he’s now driving 13 or 14 hours a day, every day, to hit his weekly goal. Rafael wasn’t surprised ...