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15 companies that will change the world

These game-changing startups are likely to upend existing industries - and spawn new entrepreneurial opportunities.

Zipcar's Griffith is turning self-serve auto rental into a viable alternative to car ownership.
CEO: Scott Griffith
Disruption: Self-serve hourly car rental in urban neighborhoods
Disrupted: Car dealers and traditional rental agencies

There are no service clerks, no paper contracts, no lines. With Zipcar, you pay a $50 annual membership, then go online to see what cars are available near you. When you get to the car, swipe your wireless ID card to get in, and the keys are inside. You pay a usage fee that runs $8 to $15 per hour. Zipcar is profitable in cities where it has been operating more than two years, including Boston, New York, San Francisco and Washington, D.C., and it's ahead of competitors like Flexcar and City CarShare.

Not your typical rental






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