I'm not sure this really should be the issue though. Maybe it should be something like...Is it more likely that high inflation develops in the next 15 years, eating away my purchasing power, or instead that the market tanks in the next 15 years and evaporates half of my networth, eating away my purchasing power? Staying in the stock market doesn't give a 100% guarantee of having all the money one needs. I don't think that should be the criterion for a cash investment either.The issue for me would be how can I be 100% sure I have all the money I would ever need...
Anyway, the OP asks a good question, and I think the answer for each of us is a personal one that centers around how we view the risk of market losses versus the risk of inflation (or of just "drifting" which a lot of people just couldn't handle). After much discussion, I helped get my parents 90% out of the stock market (they are in their mid-late 80's) a few years ago for just this line of reasoning. The risk of high inflation looked lower to us than the risk of stock market volatility over the 10-15 year timeframe we were looking at.
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