Let’s imagine for a moment that on your daily walk to work, your normal route takes you past a pawn shop that is known to display expensive jewelry. Over the past couple of days, you’ve noticed that the jewelry on display has been marked down—for reasons that you don’t really understand. All you know is that, in the past, these times when the jewelry went on sale were quite temporary and, in fact, in the past the prices were far more likely to go up than to go down.
The store also buys jewelry from the public, and over the same recent time period, the prices it is willing to pay have been declining as well.
The question is: would you pick this time to sell some of your own jewelry, or to buy some while it’s temporarily on sale?
You can apply this same thought experiment to on-sale items at the clothing rack or in the grocery store, and the answer is always the same: your inclination would be to buy when things are on sale, and to sell (if you happen to have something) whenever the prices go back up.
The peculiar thing about this thought experiment is that whenever you’re talking about jewelry, or clothing, groceries or pretty much any everyday item in the marketplace, the response is obvious. But when we’re confronted with exactly this same situation regarding stocks, ETFs or other investments, the immediate inclination is exactly the opposite.
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