The Real Threat Is Decreased Productivity

In short, the productivity acceleration of the past 10 years has created a total of $6.4 trillion in extra output since 1995, measured in 2006 dollars. That helps explain why American households, taken together, are so much richer than they were: Household nonhousing net worth, adjusted for inflation and federal debt, has soared by almost $14 trillion over the same period, despite the dot-com debacle that crashed the market.

The massive amount of additional production is a key reason why the U.S. has not faced upward pressure on prices. And good productivity gains gave the economy enough momentum to fight off the disasters of 2001–the terrorist attacks, the stock market crash, the collapse of Enron–with only a minimal recession.

But the bonanza starts to disappear if productivity growth drops much further below its current level. Such a decline is a lot more possible than most economists realize or are willing to accept.