This volume presents the fourth phase of the project. An analysis and country-by-country comparison of the effects of social security incentives on retirement behavior in Belgium, Canada, Denmark, France, Germany, Italy, Japan, The Netherlands, Spain, Sweden, the UK, and the United States.

Since the early 1980s, the U.S. economy has experienced a growing wage differential: high-skilled workers have claimed an increasing share of available income, while low-skilled workers have seen an absolute decline in real wages. How and why this disparity has arisen is a matter of ongoing...