How free self-driving car rides could change everything

You fire up a ridesharing app to head out to your favorite restaurant. But then an ad appears, offering a free ride to a new Thai spot on the other side of town. Suddenly, you're reconsidering plans: Why pay for a ride to one neighborhood when another is totally free? Ultimately, your favorite restaurant could lose a customer. Scenarios like this may play out in the coming era of self-driving vehicles.