Job polarisation has had strong effects on US workers' relative wages, according to research by Michael Boehm. His study examines whether the decline in manufacturing and clerical jobs has been responsible for the lagging wages of middle-skill workers in the United States. Comparing the...

Over the last two decades, earnings in the United States increased at the top and at the bottom of the wage distribution but not in the middle - the intensely debated middle class squeeze. At the same time there was a substantial decline of employment in middle-skill production and clerical...