Some, including Dr Riebesell, suspect that these physical and chemical effects of warming may prove a greater driver of productivity change in the ocean than altered pH.

ECONOMIST: Ocean acidification

The most important driver of our prosperity over time is productivity, or output per hour or per day worked.

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On inflation, the Fed chairman said that while high energy prices continue to be a source of risk, ongoing productivity gains in the labor market should keep wage increases--still the biggest driver of overall inflation--under control.

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