ZipCars rent for less than $10/ hour after tax. The Lyft FB ad says drivers make up to $23. That’s a max spread of $13. You probably can’t work 8 hours a day so it would have to be part-time “employment.” There is also the opportunity cost of forgoing the salary of a “real” job, but the search and transaction costs may be significantly lower using this arbitrage scheme, at least in the short term. Plus, the schedule is pretty flexible. Opportunity cost diminishes as one’s potential productivity declines, so for some relatively low-skilled workers with clean driving records this may be a viable part-time job. It may require a small bribe to get Lyft to approve of ZipCar use, however.