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UNDERNEATH the misery of the Great Depression, the United States economy was quietly making enormous strides during the 1930s. Television and nylon stockings were invented. Refrigerators and washing machines turned into mass-market products. Railroads became faster and roads smoother and wider. As the economic historian Alexander J. Field has said, the 1930s constituted “the most technologically progressive decade of the century.”

Economists often distinguish between cyclical trends and secular trends — which is to say, between short-term fluctuations and long-term changes in the basic structure of the economy. No decade points to the difference quite like the 1930s: cyclically, the worst decade of the 20th century, and yet, secularly, one of the best.

It would clearly be nice if we could take some comfort from this bit of history. If anything, though, the lesson of the 1930s may be the opposite one. The most worrisome aspect about our current slump is that it combines obvious short-term problems — from the financial crisis — with less obvious long-term problems. Those long-term problems include a decade-long slowdown in new-business formation, the stagnation of educational gains and the rapid growth of industries with mixed blessings, including finance and health care.

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If history repeats itself, this situation will eventually turn around. Maybe some American scientist in a laboratory somewhere is about to make a breakthrough. Maybe an entrepreneur is on the verge of creating a great new product. Maybe the recent health care and financial-regulation laws will squeeze the bloat.

For now, the evidence for such optimism remains scant. And the economy remains millions of jobs away from being even moderately healthy.