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> Driverless cars will reduce the total number of cars, thereby reducing the total space we use to store cars.

Why would you think an invention that makes cars better would reduce the demand for cars?

I don't think he said it would reduce the demand for cars, instead his theory is that it would reduce the demand for individual ownership of cars. The demand would probably increase, but be serviced by fewer cars because of more efficient use.

Why, the same way that increased fuel efficiency doesn't affect the number of miles people drive! ;)

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