A lot of retirement planning involves IRA and 401k purchase of equities, so what percentage(by dollars going into the market) do retirement investors represent?Any help is appreciated, If you give me good enough links I'll be happy to try to crunch the numbers myself.I saw an estimate that 16.4 trillion was in tax-advantaged U.S. retirement accounts in 2006 (IRAs, 401Ks, TSPs, 403Bs, pension funds, etc.)–Investment Company Reserarch Institute.