Research claims future jobs are clustered in a few U.S. cities

WASHINGTON–A new analysis of where "innovation" jobs are being produced in the United States paints a clear picture of a fragmented society where companies in a shrinking collection of areas are seen as crucial to the future growth cluster.

The divergence between strong-performing cities and the rest of the country in job growth, income and future prospects is an emerging focus of political debate and economic researc....