The 4% rule has been much maligned lately, as recent market woes of the past 15 years – from the tech crash of 2000 to the global financial crisis of 2008 – have pressured both market returns and the portfolios of retirees.
Yet a deeper look reveals that if a 2008 or even a 2000 retiree had been following the 4% rule since retirement, their portfolios would be no worse off than any of the other "terrible" historical market scenarios that created the 4% rule from retirement years like 1929, 1937, and 1966. To some extent, the portfolio of the modern retiree is buoyed by the (only) modest inflation that has been occurring in recent years, yet even after adjusting for inflation, today’s retirees are not doing any materially worse than other historical bad-market scenarios where the 4% rule worked.
Ultimately, this doesn’t necessarily mean that the coming years won’t turn out to be even worse or that the 4% rule is “sacred”, but it does emphasize just how bad the historical market returns were that created it and just how conservative the 4% rule actually is, and that recent market events like the financial crisis are not an example of the failings of the 4% rule but how robustly it succeeds!