In 2010, Congress asked the National Research Council (NRC), the operating arm of the National Academies, to prepare a report on the longrun macroeconomic effects of the aging U.S. population. In response, the NRC appointed an ad hoc committee, the Committee on the Long-Run Macroeconomic Effects of the Aging U.S. Population, under the auspices of its Board on Mathematical Sciences and theiā¦