Paul is correct in arguing for a large stimulus. I can't help wondering, though, if we'll need something more. Keynesianism is based on two highly-questionable assumptions in today's world. The first is that American consumers will eventually regain the purchasing power needed to keep the economy going full tilt. That seems doubtful. Median incomes dropped during the last recovery, adjusted for inflation, and even at the start weren't much higher than they were in the 1970s. Consumers kept spending by borrowing against their homes. But that's over. The second assumption seems even more doubtful: that, even if middle-class Americans had the money to continue the old pattern of spending, they could do so forever. Yet the social and environmental costs would soon overwhelm us. Even if climate change were not an imminent threat to the planet, the rest of the world will not allow American consumers to continue to use up a quarter of the planet's natural resources and generate an even larger share of its toxic wastes and pollutants.

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