Okun's rule-of-thumb relates the long-term empirical finding that a country's unemployment rate is closely related to a country's output (or GDP) - perfectly sensible and comprehensible. In fact to be a little more explicit, it is the change in unemployment that is more notable in its relationship to the potential GDP (the output gap). His original work noted that a 3% increase in output corresponds to a 1% decline in unemployment rates (and/or rise in labor force participation, rise in hours worked, and rise in labor productivity) but as Goldman Sachs notes this week, Okun's Law has broken. As they point out, even though US real GDP growth has averaged a meager 2.5% pace since the end of the recession, the unemployment rate has fallen almost two percentage points from its peak.
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There are three implications, in our view: the unemployment rate is hopelessly miscalculated (and is much higher); potential growth is much lower than economists have been expecting (not such good news for real growth); and the multiplier effect of money has dropped structurally (in other words the implied money flow from more workers is not circulating the way it empirically has to juice growth).
It seems to us that none of these are good for growth as the reality of a higher unemployment rate (BLS adjustments aside) is negative, lower potential for growth impacts earnings expectations (as we are already seeing in company and analyst outlooks which has perplexed those market watchers pinning their hopes on the jobless rate), and the balance sheet recessionary impacts of the 'employed' minimizing debt rather than maximizing potential gain is a further drag. Either way, as Goldman notes the potential growth rate going forward (2012 and 2013) is likely to remain quite weak, in the neighborhood of 2% in line with the CBO's dismal views and this could be further exacerbated by the drop in labor force participation we have noted vociferously.
Source: Goldman Sachs