This paper examines how workers use 401(k) plans by examining their participation, contribution, and withdrawal decisions. Sixty-five percent of eligible workers participate in 401(k) plans. Employee participation rises with income, age, job tenure, and education. While participation also rises...

We examine inventory adjustment in the U.S. manufacturing sector using quarterly firm-level data over the period 1978-97. Our evidence indicates that the inventory investment process is nonlinear and asymmetric, results consistent with a nonconvex adjustment cost structure. The inventory...

We examine the behavior of trade inventories using both industry-level and high-frequency firm-level data. The cost structure underlying the firm's optimization problem convex delivery costs vs. fixed costs of ordering provides the two competing hypotheses. In the presence of fixed costs (S,s)...