Via Greg Mankiw :
This graphic is from john taylor, who plots it using quarterly seasonally adjusted data from 1990Q1 to 2010Q3. Investment here is fixed investment.
Of course, causality goes in both directions: Strong investment demand leads to lower unemployment, and a stronger economy, reflected in lower unemployment, encourages investment spending. As a result, the interpretation of this scatterplot can be debated. But there is no doubt that the strength of the correlation is impressive.
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