Updated: Oct 16, 2020
About 4 years ago, Morningstar Research, Inc., adjusted their recommendations of a 4% "safe" withdrawal rate... to a 2.8% "safe" withdrawal rate.
Morningstar: Time for the 3% Withdrawal Rule?
Seeking Alpha: Is The 4% Rule Becoming The 2% Rule? https://seekingalpha.com/article/3557356-4-percent-rule-becoming-2-percent-rule
Chicago Tribune: The Journey: Study Warns 4% retirement rule is no longer safe
Morningstar: What History Says About Safe Retirement-Withdrawal Rates
ThinkAdvisor: Wade Pfau: Coronavirus Tears Up 4% Rule