I always welcome skepticism, I've been known to be wrong a time or two! :) It's part of the learning process.
However, if you don't like my data, please present some of your own. Here's another source (cfiresim.com), and it shows the
prudent investor/retiree would not have been "wiped out and lost everything". I entered a start year of 1929, with a 75/25 AA, a 3.5% initial withdraw rate, adjusted for inflation each year ($35,000 on a $1,000,000 portfolio). So while this was a scary ride, he was far from being "wiped out". The $1M stayed above $500,000 in buying power. It dipped again by the end of WWII, and then took off.
Thirty years later, he has a portfolio with more buying power than he started with, even though he withdrew an inflation adjusted $35,000 for 30 years!
If this appears to be contrary to your sense of the Great Depression, it is seldom considered that this was also a period of high deflation. Your (limited) money bought much more, I even recall my Father telling me that if you had cash, you were a King in those days (sadly, my family had only land, poor dirt-farmers). This chart is shown as adjusted for inflation/deflation.
And even this chart overstates things. This really represents someone who "won the lottery", and suddenly has $1M appear out of nowhere, and put it all in the stock market at one time, (and was one of the worst market-timers in history!). In reality, the much more common, and more realistic scenario is someone who was earning and investing for ten or more years prior to retirement. So they also benefited from the big rise in the market in those early years. You could re-run this for the accumulation scenario for the previous 10-20 years, and I think you'll find this retiree would have been thrilled with the > $500,000 portfolio at it's trough - he put far less than that into it!
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