President Obama's FY 2013 Budget proposes a bold plan to renew and expand America's infrastructure. The plan includes a $50 billion up-front investment connected to a $476 billion six-year reauthorization of the surface transportation program and the creation of a National Infrastructure Bank. In support of this commitment, the Department of the Treasury, with the Council of Economic Advisers, has updated our analysis of the economic effects of infrastructure investment. The new data and analyses confirm and strengthen our finding that now is an ideal time to increase our investment in infrastructure for the following four key reasons: Well-designed infrastructure investments have long-term economic benefits and create jobs in the short run; This economic activity and job creation is especially timely as there is currently a high level of underutilized resources that can be used to improve and expand our infrastructure; Middle-class Americans would benefit disproportionately from this investment through both the creation of middle-class jobs and by lowering transportation costs for American households; and There is strong demand by the public and businesses for additional transportation infrastructure capacity.