During retirement, deciding how much to withdraw each year from investments can be complicated when both the length of retirement and returns on assets are not known. Unknown longevity presents a tradeoff in which a retiree can either spend generously and risk outliving savings — or spend conservatively and live a less enjoyable retirement. But it is possible to know an outcome before investing. Consider Buffer ETFs™ and other Defined outcome ETFs™ that use options strategies to shape a return