The Glidepath And Systematic Withdrawal Theory: Do They Still Apply In Today’s Interest Rate Environment?
William Bengen is considered the father of the systematic withdrawal theory. Bengen, in his extensive research, tested hundreds of portfolios to create a standard portfolio withdrawal rate that would survive portfolio failure. His research concluded that a 4% percent withdrawal rate was safe. He dubbed it the SAFEMAX rate. It also supported the assumption that a well-funded [...]