book-to-market ratio
The ratio of a company's book value to its market value, with higher ratios suggesting the stock may be undervalued relative to its accounting value.
Example
“Value investors seek stocks with high book-to-market ratios, suggesting the market underprices the company's assets.”
Memory Tip
High book-to-market = accounting value exceeds market price. A value investor's signal.
Why It Matters
Understanding book-to-market ratio helps you identify potentially undervalued investment opportunities when building a diversified portfolio. A higher ratio may indicate stocks trading below their accounting value, which some investors view as a margin of safety against losses and a signal that the market has underpriced the company.
Common Misconception
Many people assume that a high book-to-market ratio always means a stock is a good buy, but this ignores the reasons why the market may have priced it lower. The market price reflects future earning potential and risks, so a low market value compared to book value might indicate real problems like poor management, declining industry prospects, or structural business challenges.
In Practice
Consider a manufacturing company with a book value of 50 dollars per share but trading at a market price of 25 dollars per share, giving it a book-to-market ratio of 2.0. An investor might see this as undervalued, but further investigation could reveal the industry is shrinking or the company carries obsolete inventory that will never generate returns, explaining why the market values it at half its accounting value.
Etymology
BOOK (accounting value) TO MARKET (stock market value) RATIO. BOOK value versus MARKET value.
Common Misspellings
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