[Excerpt] This Congressional Budget Office (CBO) study, which was prepared at the request of the chairman and former ranking member of the Senate Committee on Finance, documents changes in the level and distribution of hourly wages received by workers in the United States between 1979 and 2009. It also reviews the leading explanations for changes in the supply of, and demand for, workers with different sets of skills as well as the role of labor market institutions in affecting wages. In keeping with CBO’s mandate to provide objective, impartial analysis, this study does not make any recommendations.