A far-reaching transformation is taking place in the US in the relationship between employers and employees. The lessons learned from Japan and from "best practice" companies like IBM about how job security, training, and internal development can improve employee commitment and performance have given way to a new set of lessons about how companies can redue fixed costs, increase flexibility, and improve performance by eliminating the elaborate employment systems that prepared employees for long careers in the company.

Where the old arrangement protected employees from outside market...