Here I collect some questions I would have liked to have asked these experts.
1. How should stock and bond valuations affect withdrawal rates and asset allocations?
It seems logical that retirees should spend a lower percentage of their portfolios when stocks or bonds become expensive. However, it is not at all obvious how to account for valuations. I made up two adjustments for my own retirement. The first is that when Shiller’s CAPE exceeds 20, I reduce future stock return expectations by enough to bring the CAPE back to 20 by the end of my life. These lower return expectations result in spending a lower percentage of my portfolio after doing some calculations that are similar to required minimum withdrawal calculations. I have no justification for this adjustment other than that it feels about right.
The second adjustment is on equally shaky ground. When the CAPE is above 25, I add the excess CAPE above 25 (as percentage points) to the bond allocation I would otherwise have chosen in the current year of my chosen glidepath. Part of my reasoning is that when stock prices soar, I’d like to protect some of those gains at a time when I don’t need to take on as much risk.
Are there better ideas than these? What about adjusting for high or low bond prices?
2. How confident can we be that the measured “retirement spending smile” reflects retiree desired spending levels?
I find that the retirement spending smile is poorly understood among advisors (but not the podcast guests). In mathematical terms, if S(t) is real spending over time, then dS/dt has the smile shape. Many advisors seem to think that the spending curve S(t) is shaped like a smile. I’ve looked at many studies that examine actual retiree spending in different countries, and there is always evidence that a nontrivial cohort of retirees overspend early and have spending cuts forced upon them later. Both overspending retirees and underspending retirees seem to have the dS/dt smile, but at different levels relative to the x-axis. Overspenders have their spending decline quickly initially, then decline slower, and then decline quickly again. Underspenders increase their real spending early on, then increase it slower, and finally increase it quickly at the end.
I don’t see why I should model my retirement on any data that includes retirees who experienced forced spending reductions. The question is then how to exclude such data. I saw in one of Dr. Blanchett’s papers that he attempted to exclude such data for his spending models. Other papers don’t appear to exclude such data at all. In the end, it becomes a matter of choosing how high the smile should be relative to the x-axis. If it is high enough, the result becomes not much different from assuming constant inflation-adjusted spending. Continue Reading…