A new study released this week by respected finance economist Robert Shiller finds up to three out of four workers who opt for President Bush's default investment option in his Social Security privitization plan would fare worse than if they remained in the traditional system. Using computer simulated models based on historical data, Shiller found a "disappointing outlook for investors in the personal accounts relative to the rhetoric of their promoters" and that Social Security actuaries and the Bush administration are using estimates of rates of return that are far to optimistic based on historical averages. Shiller concludes, "Given the risks, [Bush's] plan could be disastrous for some workers." Read more about the study in this Washington Post article.