摘要：We apply the measure of dynamic correlation developed by Croux, Forni and Reichlin (2001) [A measure of comovement for economic variables: theory and empirics. Review of Economics and Statistics 83, 232-241] to the relation between the quarterly rates of unemployment and labor productivity growth for the post-war United-States economy. The application of the dynamic correlation reveals that these variables are strongly related, but in a different manner according to the frequencies considered: negatively at low frequencies and positively at business cycle frequencies.
