Why Short Selling Is a Good Thing for the Stock Market and Investors Large and Small

We noted earlier the hubbub over a hive of little investors on Reddit outfoxing some big Wall Street firms who had made massive short bets on the stock of GameStop. Some of the narrative around this event has painted short selling as a secret, evil practice only available for the big guys. But none of that is true.

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QE, Stock Prices, and TINA

The U.S. economy as quantified by GDP has been sputtering along in slow growth mode for a number of years. It took a huge hit in 2020 due to covid shutdowns and has not nearly recovered. But stock prices have been rocketing upwards, and this past year is no exception. Markets took a cliff-dive in March, but have since way overshot to the upside.

Here is a plot of the past five decades of U.S. GDP and of the Wilshire 5000 index, which approximates the total stock market capitalization in the U.S.:

Chart Source: St. Louis Fed, as plotted by Lyn Alden Schwartzer

These two curves have crisscrossed each other over the past five decades, but in recent years the stock market has roared to the upside. One of Warren Buffet’s favorite metrics as to whether stock are overvalued is to consider the ratio of these two quantities, i.e. the market-capitalization-to-GDP (Cap/GDP) ratio:

Source: Lyn Alden Schwartzer

The ratio is much higher than it has even been. The last time it got this high was in 2000, and that did not end well.

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