Why the Autumn Boom Repeats: Human Nature, Not Stocks

The autumn boom in Wall Street resembles all other stock booms, because the psychology of the boomers has not changed and cannot change. The Tulip Craze in Holland, or John Law's Mississippi Scheme in France, or the South Sea Bubble in England in most things were the counterparts of the present speculation in the country. After all, booms are made by men, and not by stocks or flowers or town lots or wheat or mines or war.

The Mechanism Behind the Repetition

The simple read is that markets cycle because of greed and fear. The better market read is that the mechanism is structural: each boom starts with a genuine innovation or liquidity event, then shifts from valuation to narrative. In 1915, the catalyst was war-driven commodity demand and a new wave of industrial stocks. In 2025, the catalyst is AI infrastructure spending and the repricing of hyperscaler earnings. The stage changes. The sequence does not.

Edwin Lefevre captured this in 1915, observing that customs and costumes change but human nature remains the same. The practical implication for a trader is that the specific asset class – tulips, Mississippi land, South Sea shares, or NVIDIA stock – is less important than the phase of the cycle. The early phase rewards conviction. The late phase rewards liquidity management.

What This Means for the Current Market

A trader reading Lefevre today would ask: which phase are we in? The autumn boom he described was the late-cycle acceleration, where volume rises, new entrants arrive, and the original thesis becomes a story. That is the dangerous phase. The risk is not that the thesis is wrong. The risk is that the thesis becomes irrelevant because price has disconnected from the underlying mechanism.

For a stock like Apple (AAPL) or NVIDIA, the question is whether the current valuation still reflects the innovation cycle or has shifted to narrative. The Tulip Craze did not end because tulips lost their beauty. It ended because the marginal buyer stopped believing the next buyer would pay more. The same logic applies to any momentum-driven rally.

The Decision Point the Story Creates

The article creates one clear decision point: identify whether the current boom in your watchlist is still in the innovation phase or has entered the narrative phase. If the catalyst is still real – a new product, a regulatory shift, a earnings inflection – the trade is still structural. If the catalyst has become a story about what other people will buy next, the trade is now a momentum trade with a hard stop.

The Next Catalyst Point

The next catalyst for this cycle is the same as it was in 1915: a liquidity event that forces the marginal buyer to sell. In 1915, it was the end of war-driven demand. In 2025, it could be a Fed pivot, a credit event, or a single earnings miss that breaks the narrative. The specific trigger is unknowable. The mechanism is not. When the liquidity that fueled the boom reverses, the boom ends – regardless of the underlying asset.

Lefevre's insight is not a prediction. It is a framework. The trader who understands the mechanism does not need to predict the trigger. They only need to recognize the phase.