What History's Financial Crashes Tell Us About What Might Come Next

CAYCOG | October 2026

Every so often, the ground shifts under the global economy. Markets that felt unstoppable suddenly aren't, banks that seemed bulletproof need rescuing, and ordinary people watching their pensions and paychecks wonder how nobody saw it coming. It's happened before, more than once, and understanding the pattern is the first step to not being blindsided by whatever comes next.

I become interested in this during The Covid era, Lockdown in the UK in 2020. I began to read, explore and watch films relevant to what this meant for my future.

This post looks back at the 2008 financial crisis, traces the roughly decade-long rhythm of major crashes before and after it, and takes an honest, a predictive look at the next downturn — and the growing role of AI in the economy — might mean for us.

2008: The Crash That Redefined "Too Big to Fail"

The 2008 global financial crisis didn't start on Wall Street trading floors — it started with mortgages. Through the early-to-mid 2000s, US banks extended cheap, easy credit to homebuyers, including many "subprime" borrowers who wouldn't ordinarily have qualified for a loan. Housing prices climbed for years on the assumption they'd keep climbing forever. Banks bundled these risky mortgages into complex securities and sold them on to investors worldwide, spreading the risk without anyone fully understanding how much risk there actually was.

When US house prices peaked around 2006 and then began falling, the whole structure unravelled. The moment that made it unmistakable was September 15, 2008, when the investment bank Lehman Brothers collapsed into bankruptcy — still the largest in US history. Credit markets froze almost overnight. Governments stepped in with massive bailouts to stop the banking system from failing entirely, but the damage was already done: a deep global recession, millions of home foreclosures, widespread job losses, and a hit to household wealth that took years to repair. It also left a lasting scar of public distrust in banks and regulators that, in many ways, still shapes politics today.

A Familiar Rhythm: Crashes Every Decade or So

Zoom out, and 2008 looks less like a one-off and more like a data point in a pattern: Let's just look at the most recent three:

• 2000–01 — Dot-Com Crash. Years of speculative investment in unprofitable internet companies unwound fast, wiping out roughly $5 trillion in market value as the NASDAQ fell nearly 80% from its peak.

• 2008 — Global Financial Crisis. A US housing bubble, built on subprime mortgages and packaged into securities sold worldwide, collapsed and dragged the global banking system down with it. Covered in detail above.

• 2020 — COVID-19 Crash. A global pandemic and lockdowns triggered a sudden, severe shock and panic selling. Unusually, it was also the fastest recovery of the group — markets rebounded in months, propped up by unprecedented central bank and government stimulus.

Each crash has had a genuinely different cause — regulatory failure, currency contagion, speculative mania, a pandemic — and no serious economist claims crashes run on a predictable timer. But the recurring rhythm of build-up, excess, and correction is hard to ignore that this is somewhat in and around every decade, right?

Is 2028 Next — And What Role Does AI Play?

Given that pattern, it's reasonable to wonder whether the next major downturn is due around 2028, roughly a decade after COVID rattled markets and two decades after 2008. That's a view worth taking seriously as a possibility, not a certainty — no one, however experienced, can reliably call the exact date of the next crash, and this shouldn't be read as financial advice.

What's notable is where today's warning signs are concentrated: artificial intelligence. Several economists have flagged that AI-related stocks and infrastructure spending now make up an outsized share of market gains and even broader economic growth, with some analysis suggesting AI investment accounted for the large majority of US GDP growth in the first half of 2025. Valuations for major AI-linked companies are being compared to dot-com-era extremes, and a growing chorus of central bank economists and market strategists have warned that a sharp correction in AI stocks could ripple out to index funds, pensions, and everyday savers, given how concentrated markets have become in a handful of tech giants.

If a downturn does materialise in the next few years, AI is likely to be central to the story either way: as the trigger, if the current investment boom turns out to be overbuilt relative to real returns, or as part of the recovery, given how deeply AI tools are already being woven into productivity and business operations. The honest answer is that nobody knows for certain — but understanding the pattern helps us stay informed rather than caught off guard.

What Ray Dalio Is Predicting

It's worth mentioning one of the most prominent voices currently warning about a coming downturn: Ray Dalio. Dalio founded the hedge fund Bridgewater Associates from his New York apartment in 1975 and built it into the largest hedge fund in the world before stepping back from day-to-day leadership in the early 2020s. He's also the author of several bestselling books on economic cycles, including Principles for Navigating Big Debt Crises, which makes him one of the most widely followed voices on long-term debt cycles. Most of you may of heard of him from a recent podcast with Steven Bartlett on The Diary of a CEO.

Dalio's current warning centres on US government debt. He argues the country is entering the painful final stage of what he calls the "Big Debt Cycle," driven by years of spending roughly $7 trillion annually while collecting only around $5 trillion in tax revenue. He's described the likely result as a "debt-induced economic heart attack," which he expects "in three years, give or take two" if the current course isn't changed — comparing it to the cumulative effect of "overeating fatty foods and smoking" over a lifetime, rather than a single sudden event. In his view, the most probable outcome isn't a classic crash but a slower, stagflationary squeeze — echoing the 1970s — as government is eventually forced to print money to cover its obligations, eroding the value of debt and savings over time rather than collapsing markets overnight. His proposed fix is for the US to bring its deficit down to around 3% of GDP.

It's one influential prediction among many, not a consensus forecast, and worth treating the same way as the 2028 timeline above: a useful lens, not a certainty.

What Could This Mean for Your Money in the UK?

A quick note before this section: none of what follows is personal financial advice, and we're not qualified to give it. Nobody — including seasoned economists — can reliably predict interest rates or time a market. What we can do is lay out the factors UK households are weighing right now, so you're better equipped to have that conversation with a professional.

On savings — hold or spend?

• Markets and interest rates move in cycles, and trying to guess the bottom or top of either is notoriously difficult, even for professional fund managers.

• Many financial planners suggest keeping a cash emergency fund (often cited as three to six months of essential expenses) in an easy-access or fixed-term savings account regardless of what the wider market is doing, simply because uncertainty is when an emergency fund matters most.

• Big, irreversible spending or investment decisions made purely out of fear of a future crash — or FOMO about missing a boom — are exactly the kind of decisions that tend to be regretted in hindsight.

  
  

On mortgages — fix early or go variable?

• As of September 2026, the Bank of England base rate stands at 3.75%, held for a fifth consecutive meeting, though the Monetary Policy Committee is split, with some members pushing for a rise to 4% amid energy-driven inflation risks. The path from here is genuinely uncertain.

• Average fixed mortgage rates currently sit around 5.6% for two-year deals and 5.65% for five-year deals, with the best available rates lower depending on your loan-to-value.

• A fixed-rate deal locks in payment certainty for the length of the term, which can be valuable if you value predictable budgeting or think rates may rise — but you could be tied into a higher rate (often with early repayment charges) if rates later fall.

• A variable or tracker deal moves with the base rate, so payments could fall if rates come down, but they could also rise if they don't — suiting those with more spare income or a higher risk tolerance.

• Your right choice depends on your personal circumstances — how long you plan to stay in the property, how much payment shock you could absorb, and your wider financial position — not on a blog post's read of the market.

If you're weighing any of these decisions, please speak to an FCA-regulated independent financial adviser or a whole-of-market mortgage broker, who can look at your actual numbers and give advice tailored to you.

Let's Talk About It

History doesn't repeat itself perfectly, but it does rhyme. Whether or not 2028 turns out to be the next inflection point, staying informed and financially resilient is something we can all work on together. We'd love to hear your thoughts: do you think the AI boom is a bubble, or the start of something more durable? Drop a comment, come along to our next community discussion, or reach out — this is exactly the kind of conversation caycog.org exists for.