How did we get pension calculations so wrong?

Workers will have to save much more of their salary or stay in their jobs a lot longer if they want a decent income in retirementThere is a rule of thumb that financial advisers and asset management companies use to tell us how much we need to save, and how long our pensions will survive in retirement. But research released this week finds that we’ve been getting it wrong all along.The rule of thumb is that the safe level of withdrawal from your pension is 4% a year. Advisers say that as l