Well you can look at the dot com crash to recovery then crash again such that those, as stated in a NYT bit today (not gonna bother linking), “who stuck with the S&P 500 index after the dot-com crash were still hurting a decade later. The numbers are sobering. Those unfortunate enough to have bought S&P 500 index funds at the March 2000 peak were sitting on a loss of 8.3 percent, including dividends, a decade later”. And it took 25 years to recover from the crash of 1929.
Do we need to be prepared to weather those sorts of circumstances?
None of know for sure. That’s the problem. The AI boom could never crash and actually deliver increased productivity in ways we are not even yet imagining. Or it could pop and bring all sectors crashing on the ride. Or it could, and this what I’m guessing, have a significant correction before recovering at a different pace.
I personally ask myself a few related questions:
How long can I wait out a broad downturn in equities without having to go into the seed corn?
How much tolerance do I have for wild swings in each direction?
What are my options to enable me to wait it out longer and/or lower volatility?
How afraid of those things am I vs afraid of missing out on opportunities to grow the amount?
And I recognize that I am lucky. I was dollar averaging all through those down years so they were more opportunity for me than horrific. At 66 my wife and both I enjoy our jobs, and plan to continue working well into the next decade barring some unforeseen event. And more likely than not Social Security will stay intact enough to add to that income at maxed out amounts in a few years.
So odds are I can wait out a decade of 50% downturn without needing to go into savings at all. And by 25 years out I am likely dead.
That allows me to continue my relatively high tolerance of volatility.
But given that I think some correction in the AI sector will happen at some point in the not distant future I am uncomfortable with how much an S&P index is tied to the Mag 7. So I going to overweight to mid cap and more value oriented large stocks. They’ll survive a possible AI correction better. And still maybe something like 20% bond funds of different sorts and 8 to 9% in gold. (Not counting value locked up in business equity, or in a family real estate partnership) Those may enable being able to buy into any possible crash with regular annual rebalancing. Or may not. As noted bonds aren’t as decoupled from equities as reliably nowadays. Gold is a wild card as to how it could go. That it’s biggest attraction! But I won’t go much more defensive than that.
If we both hated our jobs and wanted to stop? The specter of a possible crash would scare me more. If I hadn’t been the beneficiary of dollar averaging in during the dot com and financial crash times, I would be less sanguine.
Point being that even among people with similar assessments of the risk of a major downturn at some not distant point, and same age, there is not a one size fits all approach.