Guest Post by Andrew Nelson and Rich in Ct, with a note by Humble Talent

[I would say that finance is among my worst topics along with soccer and calculus. My request for clarification on the current GameStop controversy and its ethics implications attracted helpful responses, and I am combining them into one collaborative post. First, Andrew:]
Gamestop, a publicly traded company, was seen as undervalued by some users of an internet forum, in this case, a reddit forum called r/wallstreetbets. That same stock was seen as on the brink of collapse by a hedge fund management group, Melvin Capital, who decided to short sell….
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Here Humble Talent clarifies:
A short sell is when someone, usually a broker, is holding stock in a company they think is overvalued. They owe their client X number of shares, regardless of the price. So if you have 100 shares of Game Stop stock at $4, and you think it’s going to $2, you sell at $4 and then rebuy the stock at $2, pocketing the difference and letting your client swallow the loss. It’s a loss they would have swallowed one way or the other, so they’re not really hurt, per se. Basically, you’re betting that a stock will go down in value. If the stock instead increases in value, you lose the difference. I think it breaks a fundamental fiduciary duty and should be illegal, but it’s where we are.
So what happened here was that a lot of people thought Game Stop was overvalued, it was listed at approximately what I said it was, between $3 and $4 per share. Short sellers were banking on it decreasing in value, so they sold all their client’s shares. Now that there’s been a ridiculous noise buy on these stocks, and they’ve *increased* in value 1000% (real number) instead of decreasing 50% (expectation) the firms that short sold the stock are going to have to find stock to buy to make their client’s portfolios whole. Which means that they will have to buy thousands of shares back at $400 when they sold them at $4, instead of $2, which they expected to. That 2000% difference over all those shares represents tens of millions of dollars, just on the Game Stop shares.
Basically, a bunch of unethical portfolio managers got their paws slammed hard in the cookie jars of their client’s portfolios, and it’s magnificent.
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….Whether through intent or accident, these two groups converged on Gamestop at roughly the same time.Regardless of original intent, the users of the reddit forum got more and more people to buy into that stock, causing the price per share to inflate drastically. It’s sitting at over $400 per share when I last checked. A similar situation is happening with AMC stock, though with less drastic inflation.