Op-Ed: With today's market volatility, the '4% rule' creates risk for America's retirees

While some of the underlying thinking behind the so-called 4% rule was prudent, it was hatched in an era in which interest rates were much higher, capital markets less volatile and, most important, Americans had shorter lifespans. Given today's market volatility and changed retirement landscape, it's safe to assume that the 4% rule may be obsolete.