We use data from the Canadian 2-year longitudinal Labour Market Activity Survey of 1986-87 to estimate the effect of the Unemployment Insurance (UI) system on job duration. Particular attention is focused on the "entrance requirements" of the UI system, which relate eligibility for UI benefits to an individual's recent employment history. The article makes operational the UI entrance requirement provisions which take into account variations in the regional unemployment rate. Controlling for many personal and job characteristics, we find evidence that a significant number of jobs terminate when they have reached the duration that would permit a UI claim.

A major issue in the analysis of unemployment durations concerns distinguishing genuine duration dependence of the exit rate out of unemployment from unobserved heterogeneity. We present a method for the nonparametric estimation of both phenomena, designed to be applicable to time-series data on aggregate outflows from different duration classes. The model explicitly takes into account that individual exit rates are affected by the business cycle and by seasonal effects. The method is applied to U.S. data. We find diverging duration effects among black and white individuals. However, except for white males, duration dependence is dominated by unobserved heterogeneity.