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The key to this concept taking off one day will be that the economics pan out — for the companies, the car owners and the drivers.

The concept of car sharing — where drivers can rent cars by the minute or hour from a company like Zipcar — has yet to reach mainstream status, but already, it's emerged with a new format in certain cities. That's peer-to-peer car sharing, where regular car owners rent out their personal vehicles to the community by the minute or hour and make money off of their car while providing a service to the community. The key to this concept taking off one day will be if the economics pan out — for the companies, the car owners and the drivers. Here are four important things to consider.