The obvious answer to the question posed in the title is that the market is complicated, and therefore people who don’t understand it are more likely to fall into conspiracies than to admit their ignorance. But I truly am blown away by how common stock market conspiracies are amongst “retail” investors. I don’t just mean the meme stock traders, many many retail investors I’ve spoken to have conspiracies about how the amorphous Wall Street is driving the market one way or the other in order to “punish” someone. Usually the argument goes that X company is a threat to Wall Street, either because it supports some politics that Wall Street doesn’t or because its technology is highly disruptive to an entrenched industry. Therefore Wall Street “punishes” it by deliberately pushing down its stock price.

Just as an aside, that disruptive tech idea is dumb merely on the face of it. The idea is usually said to me as “Wall Street has too much money invested in Y industry, and X company has a technology that could totally disrupt it. Wall Street is protecting its investment by forcing down X company.” This is dumb on the face of it: Tesla, Amazon, and Apple were all exceptionally disruptive and still grew by leaps and bounds. Just because some investors have their money tied up in Ford doesn’t mean other investors won’t give Tesla a shot. Not every investor on Wall Street is invested in the same things, so the idea that they would act as a collective unit is nonsense.

As another aside, I wrote early about how this was a conspiracy I see a lot when talking about nuclear fusion. The idea is that fusion is such an amazing energy source that all other energy sources can’t compete, so they work together to keep it down. But if they can keep down fusion, why haven’t they kept down every other disruptive tech that upended industries through creative destruction? I never get a good answer.

Anyway I think this widely held believe, that Wall Street “punishes” stocks and causes them to go down, is simply another case of people not understanding that the market is filled with individuals acting in their own selfish interest. The only way Wall Street could act as a collective would be if each and every investor was forced to act the same way no matter what.

Say Company X has stock selling at 20$. Some Wall Street investors think that 20$ is a fair price for that stock. But some Wall Street investors are angry that Company X has technology which will disrupt their investments, so they want to “punish” it and force its price down to 1$. They can try to do this by selling the stock, but if the stock falls to say 15$, then the investors who think 20$ is a fair price will happily snap it up, because if 20$ is a fair price, then 15$ is a deal. Quickly the buying pressure from investors who think it’s undervalued should overwhelm those who want to push it down, and the price would stabilize.

Now there are two reasons this mechanism could fail. One is that all investors are forced to act in concert, which again doesn’t make sense at all. Investors compete fiercely with one another, they do not work together for common benefit. And furthermore working together creates a huge prisoners’ dilemma, if even one investor breaks with the group at large, they can reap enormous rewards by buying up stock with a fair value of 20$ for just 1$. Getting to 20x your money for free is a huge incentive to break with the collective, and no greedy investor would pass such an inventive up.

The second reason this mechanism could fail is that there are very few investors who believe the fair value is 20$, and most agree the value is 1$. But that isn’t a conspiracy in action, that’s price discovery in action. The price is an equilibrium between the expectations of the buyers and the sellers. If more and more people think its fair value is higher than at present, its price will go up. If more and more people think its fair value is lower, price will go down.

Trying to “force down” the price of a stock below its fair value is not a profitable way of doing business. No one investor or group of investors control the market, the market is a huge competition between all investors. And so while selling a stock for a price below its fair value can momentarily drop the price, it’s also a great way to lose your own money. Meanwhile if the market is filled with investors who think the fair value is higher, they’ll buy the stock back up to the original point. All you’d succeed in doing with this trick is burning your own money.

The price of your favorite stock went down because more investors thought it was overvalued than thought it was undervalued, not because of some huge Wall Street conspiracy.