There were demonstrations that allowed you to play music on headphones, test if products were genuine or counterfeit, or that let you replace your car keys or your house keys with just your phone.

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Friedman would have argued to do less and grow the monetary base at a steady rate that is the sum of what you want the long-term inflation rate to be and what you think the long-term growth of the economy will be and then, like the bumper car, take your hands off the wheel and let capitalism and markets do the rest.

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But if you need a family car and run short of cash, the trustee could let your spouse buy a Mercedes.

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As true car-sharing services proliferate (those that let you share your private vehicle and, more likely, the organized ones like Car2Go), offering a suite of options to the car-less is going to be necessary to survive.

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And shelling out for a snazzy rental car especially for a top-down model that will let you travel with the wind in your hair is one way to mix things up a bit and make the trip as fantastic as the destination.

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