GM to sell self-driving electric cars by 2019

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General Motors says self-driving cars are the next big thing. The automaker now plans to start selling them by 2019.

The company promises to mass-produce fully autonomous electric cars by then.

Those cars will be used for a new ride-sharing service.

This is the first step toward a big shift in the car business.

The automaker says ride-sharing could ultimately be bigger than its current business of selling cars.