History doesn’t repeat itself, but it does develop a habit of wearing the same costume. I’ve been thinking about that a lot lately, watching the S&P 500 put up a 23% gain in 2024 and follow it with another 16% in 2025, per S&P Global’s market data. Strong returns on their own don’t scare me. What makes me reach for a second cup of coffee is the backdrop against which they’re happening — because the last time the economic scenery looked quite this familiar, the decade ended with Black Tuesday and a generation that never fully trusted a bank again.
The 1920s were genuinely impressive. US real GNP grew at 4.2% per year through the decade, according to economic history records compiled at EH.net, and the total economy expanded roughly 42% across ten years. The stock market reflected that optimism, then dramatically exceeded it. By January 1929, the Dow was closing around 307, which sounds modest until you remember it had been a fraction of that at the decade’s start. The wealth was real, up to a point. The speculation layered on top of it was not. The Federal Reserve issued a warning about excessive speculation as early as March 1929, which briefly rattled the market, and then everyone went right back to the party. The recession that had already begun in the summer of that year wasn’t visible enough from the trading floor. By October 24 — Black Thursday — 12.9 million shares traded in a single session of panic, per the Federal Reserve History records. By October 29, another 16 million shares changed hands as the market lost nearly 12% in a day. The rest, as they say, is misery.
Now look at the 2020s. Global GDP grew 3.1% in 2024, according to investing.com’s economic data, with US annualized growth at 2.8% in Q3 of that year. Solid. Not roaring-twenties dramatic, but solid. Equity markets have been enthusiastic well beyond what the underlying growth numbers would suggest. The top 1% income share in the United States had climbed back to levels last seen around 1929 — nearly 24% — according to wealth distribution data referenced across multiple economic sources. Wealth concentration of that magnitude isn’t just a fairness issue. It’s a structural fragility. When consumption depends heavily on the continued spending of a narrow slice of the population, any shock that hits asset values hits the whole engine at once. I don’t quote crash forecasters to endorse their timelines — forecasters who cry wolf eventually get the wolf right, and it proves less than it seems — but the fact that serious people are reaching for 1929 as the reference point is itself worth noting.
The Post-Depression Architecture Actually Worked
Here’s the thing: the people who built the post-Depression architecture were not stupid, and the institutions they created have actually worked. After watching thousands of banks fail in the early 1930s, legislators required banks to join the Federal Reserve system and created deposit insurance, per the Federal Reserve History’s account of that era. That single reform — boring, administrative, unglamorous — is probably the most important financial innovation of the twentieth century, because it severed the psychological link between “my bank is in trouble” and “I need to stand in line right now and get my money.” Bank runs are contagious in the way that fires are contagious. Deposit insurance is the firebreak.
The St. Louis Fed has documented clearly that the Great Depression demonstrated central banks must not allow banking panics to contract the money stock and cause deflation — and when 2008 arrived, the Fed applied that lesson. Loans outstanding stabilized at far higher levels than the 58% drop below the 1929 peak seen during the Depression, according to research from the San Francisco Fed. Jerome Powell stated in 2025 that the US economy remained in a solid position, with the labor market near maximum employment. That’s not spin; the underlying toolkit genuinely is more robust than anything Hoover had available to him.
Quantitative easing — the central bank practice of purchasing longer-term assets to push down borrowing costs when ordinary rate cuts are exhausted — gave policymakers a lever that simply didn’t exist in 1929. In the Great Recession, the FOMC cut the federal funds rate from 4.5% at the end of 2007 to effectively zero, per Federal Reserve History records of that period. Compare that to the passive, borderline indifferent monetary response of the early 1930s, and you understand why 2008 produced a painful recession rather than a multi-year depression with 25% unemployment. The institutional memory was there, and people used it.
But here’s where I slow down. The tools being better doesn’t mean the risks have disappeared. It means the catastrophic floor is higher. That’s genuinely good news. It’s not the same as good news about what happens between here and that floor. ITR Economics has forecast a 2030s Great Depression with high probability, driven by structural factors including the debt loads currently accumulating. The World Economic Forum has flagged that fiscal deficits running as high as 10% of GDP risk amplifying any downturn into something much worse. The geopolitical overlay — trade tensions, supply chain fragmentation, societal polarization — creates the kind of external shock risk that no amount of monetary sophistication can fully offset. Historical precedents going back to the Panic of 1873 and the Panic of 1893 all share one characteristic: the buildup was visible in retrospect and invisible in real time.
I don’t think we’re heading for a literal replay of 1929-1933. The institutional scaffolding is too different. But I do think we are in a period where the similarities to the late 1920s are numerous enough to deserve serious weight rather than dismissal. The wealth concentration is back. The equity returns are running well ahead of economic fundamentals. Global growth is slowing — estimates for 2025 GDP growth range from 2.4% to 2.7%, down from 3.1% in 2024, per multiple economic forecasts. The 1920s also looked fine from inside them. The recession that preceded the crash had already begun by summer 1929; most people just didn’t know it yet.
The single condition that would make me revise this entire assessment: if global fiscal authorities meaningfully reduced debt loads and deficit trajectories while central banks successfully guided a soft landing through 2027 without triggering a deflationary spiral. That combination would suggest the structural vulnerabilities are being managed rather than compounded, and I would stop reaching for historical analogies.
Until then, I find myself thinking about the pattern. The Panic of 1873 followed a post-Civil War boom. The Great Depression followed a post-WWI boom. Both times, a decade of genuine growth convinced people that the cycle had been mastered, that this time was different, that the good times reflected structural progress rather than borrowed time. The word I’d use for our current moment isn’t “doomed” — that’s too dramatic and too convenient for the people who sell newsletters about it. The word I’d use is “familiar.”
The market has a long memory for everyone except the people currently in it.