U.S. pension plans, 401(k) plans, individual retirement accounts and other retirement savings vehicles ended 2007 with $15 trillion in assets, up from $7.9 trillion in 1997.
Consultants at Watson Wyatt Worldwide, Washington, have published those figures in a global pension asset study.
Pension assets represent a form of wealth, rather than a flow of income or revenue, but the consultants note that U.S. retirement assets now exceed the $14 trillion U.S. gross domestic product, or national income total, for the first time.