Job chains and wage curves: Worker mobility and marshallian surpluses in evaluating regional employment growth

In theory, new regional jobs yield two distinct sources of welfare gains to workers: (1) mobility gains achieved by workers as they move up job chains and (2) traditional Marshallian surpluses enjoyed by all workers as labor markets tighten. In the past, we have argued that the second channel is likely to be small relative to the first. This paper integrates a chain model (using PSID job change data) with a modified-Marshallian model based on "wage curves" (estimated from CPS data) to formalize and test that argument. High wage jobs with modest wage-unemployment elasticities show Marshallian effects only 10 percent to 20 percent the size of mobility effects. Low wage jobs with somewhat higher elasticities show Marshallian effects from 40 percent to 70 percent the size of mobility effects.