You’ve got a great idea for a gig economy business and you’re anxious to join Amazon, Uber, Lyft and a host of other companies in the sharing economy, employing independent contractors as your workforce. But wait — you also want to make sure those contractors know how to do their jobs, and represent your company well. They need training, right?

That’s where things get complicated. In the United States, most companies that rely on the sharing economy can’t require their gig workers to take tra…