As a bear that's been very confused by markets failing to exhibit mean reversion in 2019 and 2022, and now with the Hormuz energy crisis, I've thought a lot about this. There's a lot of new things happening. Fed/QE intervention that has never stopped, just been more well disguised. Fiscal/government spend intervention. I think Mike Green's work on the rise of passive investing is really good, in particular explaining how it prevents mean reversion in absence of changing net cash flows into passive instruments. Passive will also induce or worsen the bust if net cash ever starts to flow out passive. Green's youtube interviews are great.
All to say, your SO's dad would have been right at any point prior to the current financial cycle. Knowing what's changed doesn't make forecasting easier though.
