a. Suppose the layoff rate is 0.02 and the average duration of a spell of unemployment is four and one-half months. Using Equation 10.4, what is the equilibrium unemployment rate in this economy? b. Suppose that an increase in employment insurance benefits causes the separation rate to increase to 0.021. What would be the effect on the unemployment rate and why would it change? c. Suppose that an increase in employment insurance benefits causes the average duration of a spell of unemployment to increase by one week. What would be the effect on the unemployment rate and why would it change?