This paper uses the retrospective work history data from the British Household Panel Survey to examine patterns of job mobility and job tenure for men and women over the twentieth century. British men and women hold an average of five jobs over their lifetimes, and one-half of all lifetime job...

The paper examines the optimal level of training investment when trained workers are mobile, wage contracts are time-consistent, and training comprises both specific and general skills. It is shown that, in the absence of a social planner, the firm has ex-post monopsonistic power that drives...

In this paper we develop a theory of union bargaining power based on firm-specific skills acquired by the insider work-force. We show that unions increase the bargaining power of insiders only in states of the world in which the firm would like to retain insiders but not hire outsiders. Union...