Asymmetry in Okun's law
本文用美国战后数据检验了奥肯定律中产出与失业关系的不对称性，发现周期性失业对负向产出波动的反应比正向更敏感。
Abstract. In this paper we support the proposition that the output‐unemployment relationship as represented by Okun's law is asymmetric. Okun's coefficients are defined based on a dynamic model that allows for asymmetry in the relationship between cyclical output and unemployment. Using data from the United States for the post‐war period, our results show that the short‐run effects of positive cyclical output on cyclical unemployment are quantitatively different from those of negative ones, and the data are consistent with the proposition that cyclical unemployment is more sensitive to negative than to positive cyclical output. Several theoretical explanations of asymmetry rationalize the findings.