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With the S&P 500‘s Shiller CAPE ratio close to its all-time excessive, fears of a inventory market crash are rising. I made a decision to ask ChatGPT if it thinks a crash will occur earlier than the top of the yr.
However first, what’s the Shiller CAPE ratio?
Robert Shiller’s legacy
The Cyclically Adjusted PE (CAPE) ratio was devised by legendary economist Robert Shiller. It’s a preferred valuation metric used to evaluate whether or not the market is pricey or low cost relative to its lengthy‑time period earnings energy.
The calculation is as follows:

The ratio hit an all-time excessive of 44.19 in December 1999, shortly earlier than the dot-com bubble burst. Right this moment, the ratio sits round 42.3, the best it’s been since.
By comparability, it peaked at simply 31.48 earlier than the Wall Road crash of 1929, which triggered the Nice Melancholy.
However that doesn’t imply a crash is assured. So what does ChatGPT need to say about all this?
A measured response
I’ll preface this by stating that I don’t consider AI is an effective supply of knowledge concerning markets. Nonetheless, it’s good at assessing all viewpoints impartially and summarising the information.
On this case, it did precisely that.
When requested, “Will the inventory market crash earlier than the top of 2026?“, it had this to say:
“There’s no consensus that the inventory market will crash earlier than the top of 2026, however a significant correction is feasible.”
That tells me nothing I don’t already know. It went on to make clear that whereas most banks have constructive yr‑finish targets, a minority of outstanding bears are warning of a 20%–30% decline if macro pressures intensify.
So what’s the play?
There’s two issues to find out about market crashes:
1. They’re a traditional a part of the market cycle.
2. No person is aware of precisely after they’ll occur.
The trick is to all the time be ready. A technique is by protecting money apart to take advantage of cut price costs.
That doesn’t imply shopping for something that’s low cost — some corporations by no means recuperate from a crash. I’m speaking about established, resilient companies with a monitor document of secure progress.
My present favorite?
With a various distribution portfolio spanning controls, seals, and life sciences, Diploma (LSE: DPLM) is a FTSE 100 stalwart with a decades-long historical past of double‑digit natural progress.
However proper now, it’s very costly. With a price-to-earnings (P/E) ratio of round 50, it’s greater than triple the UK common.
That’s signal — buyers clearly see future worth within the inventory — nevertheless it does imply any additional progress potential is proscribed.
That mentioned, the worth is up 802% over the previous 10 years, equating to an annualised achieve of 24.6% per yr. Contemplating every thing that’s occurred since 2016, that screams resilience to me.
But it surely doesn’t imply that’ll occur once more. Diploma depends closely on profitable acquisitions, so execution threat is ever-present. If a rival costs out one among its merchandise, it might discover itself shedding market share — and income.
The underside line
Of all of the shares on the FTSE 100, Diploma is the primary one I plan to purchase if the market crashes. I already maintain some shares, however grabbing just a few extra at a cheaper price might set me up for years of positive aspects.
That’s why savvy buyers don’t concern a market crash — they plan for it.
Do you have to make investments £5,000 in Diploma Plc proper now?
When investing skilled Mark Rogers and his staff have a inventory tip, it could pay to pay attention. In any case, the flagship Twelfth Magpie Share Advisor publication he has run for practically a decade has supplied hundreds of paying members with high inventory suggestions from the UK and US markets.
And proper now, Mark thinks there are 6 standout shares that buyers ought to think about shopping for. Need to see if Diploma Plc made the record?
Mark Hartley owns shares in Diploma.
