03/17/2012 01:32 pm ET

Sharing Your Car? Your Insurer May Not Be Pleased

At first glance, the idea of person-to-person car sharing appears to be the perfect solution to any number of problems.

People with idle cars (and most cars are idle most of the time) can make some money by renting them out to others who need a car sometimes but not often enough to own one. At some point, the world would ultimately need fewer cars and places to park them. It feels greener, and sharing is polite and all that.

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