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These are the times that try economists' souls

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Paraphrasing Thomas Paine: These are the times that try men's and women's souls ... especially if they're economists.

It's an economic law: population growth plus productivity growth equals GDP growth.

Well, the United States has the population growth, and for the past 20 years or so it's had the productivity growth. But GDP growth? Of late, that's been an empty chair at the party, as the United States remains in the grips of its worst recession in more than a generation.

U.S: In uncharted water

Further, although the 1.0% decline in Q2 GDP confirmed that the recession appears to be bottoming, economists are not jumping for joy, and investors can understand why. The three traditional engines of growth that the United States typically relies on to jump-start GDP -- consumer spending, housing, business investment -- remain in a slump, and it's an open question as to whether they will reappear as "factors of significance" capable of moving the GDP needle. And that's the main reason economists are concerned at this juncture of the current economic cycle: we're experiencing a record slump in demand, and so far it's prevented GDP from growing, despite population growth and productivity growth.

Over time, economists say GDP must increase, if a nation's population increases and its productivity does simultaneously. If they're correct, the U.S. recovery should start soon, like in Q3/Q4. On the other hand, the U.S. economy has never experienced structural changes like the ones its currently processing -- something that probably will work against GDP growth, at least in the initial stage of the recovery.

The above also underscores the need for the United States to identify/create new engines of growth: if the classic engines -- consumer spending, housing, business investment -- remain absent, the new engines will provide the fuel to "get this economy moving again," to quote President John F. Kennedy.

However, if the classic engines appear, the new engines will just add to growth, and job creation. That could cause the economy to begin to overheat -- grow at too fast a rate -- accompanied by an increase in inflation.

Rapid growth. Lots of new jobs leading to a rise in inflation. Oh, does the Fed wish it had such problems right now.

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Financial Editor Joseph Lazzaro is writing a book on the U.S. presidency and the U.S. economy.

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Last updated: November 27, 2009: 09:36 PM

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