Investing at All-Time Highs? A different take on the golden rule of investing.

One of the most fundamental concepts of investing and perhaps in all of finance is the old saying “Buy low, sell high.” While this may seem like a pretty simple concept in practice this idea falls flat very fast. Markets are much more complicated and unintuitive than they are at holiday dinner conversations or history textbooks. Just in 2021 the S&P 500 hit 100 new all time highs and each one left investors pondering if it would be the last. Even the term “all-time highs” implies that it could be a peak, but this is not the case. Since 1950 the S&P 500 has hit 1,387 all-time highs averaging a new high around every 19 days. It seems outrageous that the S&P 500 could reach a new high every 19 days despite recessions and pullbacks, but this makes more sense when considering expansion periods such as the beginning of the Pandemic. Just over the course of the pandemic the S&P reached 151 new highs, in light of the fastest economic recovery in history, leaving what we thought was the last of the pandemic. So, if all-time highs are so common does the “golden rule” of investing apply?

In principle, yes. In practice it’s another story. Buying high might not necessarily be a bad thing when considering what’s driving the price, which in the case of the S&P usually comes in the form positive economic outlooks, jumps in revenue, or general optimism. Another thing to consider is that oftentimes these all-time highs happen within days or weeks of each other and usually occur in times of economic strength or expansionary periods. Since 1950 on average 88% of highs have another within 10 days, 82% have another within 5 days, and 69% have another high within the following trading day. With this in mind it might not be a bad time to invest the next time an all-time high is reached.

Source: Standard & Poor, Data as August 1st 2022


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