One of the most fundamental rules in investing is deceptively simple: buy low and sell high.
The challenge arises when investors struggle to identify what actually qualifies as low or high in a given market environment.
Valuation techniques exist precisely to help investors navigate this uncertainty, yet many still chase hype-driven stocks at inflated prices.
Experienced investors understand that massive run-ups and astronomical valuations are ultimately unsustainable over the long term.
Those who buy into a stock after a dramatic surge can find themselves holding a position that never recovers to the price they paid.
The single biggest mistake any investor can make, according to this line of thinking, is purchasing shares in a stock that is clearly overvalued.
Warren Buffett, arguably the world’s most famous value investor, built his philosophy around finding stocks trading below their intrinsic value and waiting patiently for the market to correct itself.
One of his most celebrated quotes captures the approach perfectly: “We simply attempt to be fearful when others are greedy and to be greedy only when others are fearful.”
When other investors panic and sell, disciplined value investors see an opening to buy quality companies at discounted prices.
A recent real-world example of this strategy in action involved Berkshire Hathaway and UnitedHealth Group (NYSE: UNH), the largest medical insurer in the United States.
UNH stock had plummeted after management cut its profit outlook, creating what Buffett’s team identified as a rare buying opportunity in a fundamentally strong business.
Berkshire Hathaway purchased the stake in the second quarter of 2025 and exited the position in the first quarter of 2026, when Abel closed out several small positions.
From its drop in May 2025 to the middle of January 2026, the stock had gained approximately 24%, rewarding those who bought during the period of fear.
Investors should be careful, however, not to confuse a high share price with an overvalued stock, as those are two very different things.
Some stocks continue delivering strong returns for investors long after they have already created significant wealth for early shareholders.
Berkshire Hathaway itself did not purchase Amazon stock until 2019, and only added Alphabet to its portfolio last year, proving that timing and valuation matter more than entry price alone.
In many cases, the best opportunity to buy a proven stock arrives after the initial hype fades and the company has demonstrated consistent performance.
Resisting the urge to follow the crowd into overpriced, trend-driven investments is one of the clearest paths toward long-term investing success.
Sticking to quality companies that trade at reasonable valuations positions any investor to weather market volatility with far greater confidence.
