What is Graham Number?
2157 reads · Last updated: December 5, 2024
The Graham number (or Benjamin Graham's number) measures a stock's fundamental value by taking into account the company's earnings per share (EPS) and book value per share (BVPS).The Graham number is the upper bound of the price range that a defensive investor should pay for the stock. According to the theory, any stock price below the Graham number is considered undervalued and thus worth investing in.
Definition
The Graham Number (or Benjamin Graham Number) measures the intrinsic value of a stock by considering a company's earnings per share (EPS) and book value per share (BVPS). It represents the upper limit of the price range that defensive investors should pay for a stock. According to this theory, any stock price below the Graham Number is considered undervalued and thus worth investing in.
Origin
The Graham Number was introduced by the renowned investor and economist Benjamin Graham, known as the 'father of value investing.' He first presented this concept in his book 'The Intelligent Investor,' aiming to help investors identify undervalued stocks. This concept has been widely used in value investing strategies since the mid-20th century.
Categories and Features
The formula for calculating the Graham Number is: Graham Number = √(22.5 × EPS × BVPS). The 22.5 in the formula is the product of Graham's suggested P/E and P/B ratios. The main features of the Graham Number are its simplicity and practicality, making it suitable for preliminary screening of potential investment opportunities. Its advantage lies in providing a quick method to assess whether a stock is undervalued, but its drawback is that it does not consider market dynamics and the company's future growth potential.
Case Studies
Case 1: During the 2008 financial crisis, many companies' stock prices fell to historic lows. For example, Bank of America saw its stock price drop below its Graham Number, attracting the attention of many value investors. As the market recovered, these investors reaped significant returns. Case 2: During the 2020 pandemic, the stock prices of certain tech companies plummeted. For instance, Apple's stock price briefly fell below its Graham Number, and as the market rebounded and the company's performance recovered, the stock price quickly bounced back.
Common Issues
Common issues investors face when applying the Graham Number include ignoring the company's future growth potential and market changes. Additionally, the Graham Number is only applicable to companies with stable earnings, and its applicability is limited for high-growth or loss-making companies. Investors should combine it with other analytical tools and market research to make more comprehensive investment decisions.
