Running some spreadsheets, with 3% interest, no inflation, & no stonk market gains for 20 years, the retirement fund would drop by 25%. The cash would drop by 1/2. We all know over 20 years, interest rates are headed down & stonks are headed sideways or up. 3% & a negative stonk market seems plausible for at least the 1st 10 years. Applying very conservative 3.5% inflation as a renter, the retirement fund would drop by 50% & the cash would be gone in 20 years. The stonk segment needs to average 4% growth for the portfolio to come out flat in 20 years. There could be no transfers to the cash segment. Rebalancing to keep the cash constant would drain the stonk segment by 1/5, assuming the stonk went up 4% every year. The stonk now has to go up 5% every year to break even. Definitely better to not rebalance, but that would leave a 100% stonk weighting in 20 years. 10% annual stronk growth would yield the dream, etern...