If you owned a stock that was cut in half tomorrow, would you hold it, buy more, or sell it in a panic? We should answer this question now—before the market answers it for you.
Today, the world is in a 1999-type mood. According to Man Group, over 20% of the MSCI World Index trades above 10x annual sales—a valuation level that history has marked as dangerous ground. Leading the parade are the titans—Nvidia, Microsoft, Meta—profitable, dominant, and ringed with competitive moats deep enough to float an oil tanker.
Even the market's darlings can stumble when the ground shifts—no matter how compelling the case. History's pattern is plain:
- Above 10x sales: The median Russell 1000 stock lost 65% over the following five years; the MSCI World stock lost 33%.
- Above 20x sales: The median loss deepened to 73% and 50%, respectively.
Delivering the sustained earnings growth needed to satisfy such lofty multiples is rare. Towering expectations have a way of crumbling under their own weight.
AI enthusiasm has supercharged the rally. If ChatGPT's launch in late 2022 was the equivalent of the Netscape IPO in 1995, we could be early in a multi-year run. We could also be standing at the edge of the 2000s, with little room for error. Today's leaders are not the profitless dreamers of the dot-com era, but markets will not spare them from fits of frenzy:
- Amazon has fallen by 50% more than once.
- Netflix has cratered 80% in the past.
- Even Berkshire Hathaway—Warren Buffett's fortress—has seen half its value vanish before recovering.
Often, the business was sound while the stock was sinking—proof that Mr. Market is an emotional creature.
Your greatest defense isn't in predicting when the market will turn. It's in deciding—before you buy—how much you can own without losing sleep in a storm. Work with your advisor. Define your strategy. That strategy should involve stretching your view beyond today's high-priced market titans. Set pre-commitment contracts for selling when markets are calm. Then size your positions so a 50% drop won't derail your portfolio or your peace of mind. Sound decision-making isn't about being right all the time. It's about lowering the cost of being wrong. When the price of mistakes is high, fear controls us. When the cost is low, we approach decisions with a clearer mind. Make mistakes cheap, not rare.
Over time, successful investors aren't those who always pick the best funds or stocks—they're the ones who can hold through the gut-wrenching volatility that shakes others out. If a 30% plunge in a position makes you restless, you own too much. If a doubling makes you regret not buying more, you might own too little. Your advisor will help you find your threshold. The market may keep climbing. Or it may soon test our nerve. Either way, the real question isn't if your stocks will fall—because sooner or later, they will. The better question is: When they do, will you be ready to hold on?