The August Stock-Market Slump Is a Myth, Data Shows
Two centuries of market data contradict the popular belief that August is a bad month for stocks, yet Wall Street keeps repeating the warning.
Wall Street has long warned investors to brace for a rough August, but more than 200 years of stock-market data tell a starkly different story: stocks have typically posted gains during the month, and volatility has historically run well below average.
The persistence of the August-slump narrative raises a pointed question about how financial folklore takes hold and refuses to let go even when the empirical record contradicts it. Seasonal myths can be self-reinforcing — repeated by strategists, amplified by financial media, and eventually treated as conventional wisdom without fresh scrutiny of the underlying numbers.
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The data-driven reality suggests that investors who pull back from equities in August based on this assumption may be making a costly and unfounded tactical error. If volatility is actually subdued and returns are positive on a long-run average, defensive repositioning ahead of the month could mean leaving money on the table.
The disconnect between market myth and market reality also speaks to a broader challenge in investing: distinguishing between patterns that are statistically meaningful and those that are anecdotal or selectively remembered. August may feel dangerous in years when it is, precisely because the expectation was primed — a cognitive bias known as confirmation bias can cement a narrative regardless of its accuracy.
For individual investors, the takeaway is to scrutinize seasonal claims carefully and demand historical evidence before adjusting a portfolio around calendar-based assumptions. Continue reading at MarketWatch.com.
