Pension plans around the world are in a state of crisis. U.S. plans alone are facing a total accrued liability funding deficit of almost $4 trillion (of the same order of magnitude as the federal debt), a potential financial catastrophe that ranks among the largest ever seen. It has become clear that many government, corporate, and multi-employer pension sponsors will not be able to cope with this crippling debt and may default on promised benefits. And many of those sponsors that might be able to cope are exasperated by continuous, ongoing negative surprises-large unexpected deficits and...