Private Information, Wage Bargaining and Employment Fluctuations
扩展了Mortensen-Pissarides模型，引入雇主私人观察到的生产率冲击产生的信息租金，解释为何小幅生产率波动能通过工资粘性导致较大的失业波动。
<cross-ref type="bib" refid="b25">Shimer (2005)</cross-ref> pointed out that although we have a satisfactory theory of why some workers are unemployed at any given time, we don't know why the number of unemployed workers varies so much over time. The basic Mortensen–Pissarides model does not generate nearly enough volatility in unemployment for plausible parameter values. This paper extends the Mortensen–Pissarides model to allow for informational rents. Productivity is subject to publicly observed aggregate shocks, and to idiosyncratic shocks that are seen only by the employer. It is shown that there is a unique equilibrium, provided that the idiosyncratic shocks are not too large. The main result is that small fluctuations in productivity that are privately observed by employers can give rise to a kind of wage stickiness in equilibrium, and the informational rents associated with this stickiness are sufficient to generate relatively large unemployment fluctuations.