The great economic problem for millennia has been scarcity. People want much more than can be produced. The challenge has been to produce as much as possible and to ensure that everybody gets their fair share.

In important respects, the problem has changed. There are many more Americans who are obese than who are undernourished, for example. But that is only a harbinger of things to come. The economic challenge of the future will not be producing enough. It will be providing enough good jobs.

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