Value investing is a strategy that boils down to a simple idea: buy stocks for less than they are actually worth. Think of it like shopping for a high-quality coat. You know the coat is well-made and will last for years, and it normally costs $500. One day, you find it on a clearance rack for $250. Buying that coat is a great deal because you're paying far less than its true value. Value investors do the same thing, but with stocks.

They look for solid companies that the market has temporarily undervalued for some reason, perhaps due to bad news or general pessimism. The goal is to buy these stocks at a discount and hold them, confident that the market will eventually recognize their real worth and the price will rise.

This approach was pioneered in the 1930s by Benjamin Graham, a professor at Columbia Business School often called the "father of value investing." He literally wrote the book on it, co-authoring Security Analysis and later writing The Intelligent Investor. His most famous student, Warren Buffett, took Graham's principles and became one of the most successful investors in history, bringing value investing into the mainstream.

To think like a value investor, you need to understand two key ideas: intrinsic value and margin of safety.

The stock market is often emotional. Prices can swing wildly based on news, trends, or panic. A value investor's job is to ignore the noise and calculate a company's intrinsic value. If the market price is well below that calculated value, it might be a good investment.

Imagine you're building a bridge designed to hold a 10-ton truck. Would you build it to withstand exactly 10 tons? Of course not. You'd build it to hold 20 or 30 tons to account for unexpected stress or calculation errors. That extra capacity is your margin of safety. In investing, it protects you if your estimate of intrinsic value is a bit off or if the company runs into unexpected trouble.

Value investing is not a get-rich-quick scheme. It requires patience. Just because you've found an undervalued company doesn't mean its stock price will shoot up overnight. It can take months, or even years, for the market to correct its mistake.

This long-term perspective is crucial. Value investors see themselves as part-owners of a business, not just holders of a stock ticker. They are willing to wait for the company's true value to be recognized, collecting dividends and letting the business grow in the meantime. They don't try to time the market or react to every headline. Instead, they focus on the underlying business and trust that its quality will eventually be reflected in the stock price.

Ready to check your understanding of these core principles?

Understanding these foundational ideas—buying with a margin of safety and holding for the long term—is the first step in applying the value investing mindset.