Concept
Intrinsic Value
3 books in the library reach for this idea - each in its own way. When independent authors converge on one concept, it usually deserves attention.
The Intelligent Investor
How this book uses it: The true worth of a business based on fundamentals (earnings, assets, cash flow, growth prospects) - not what the market says it's worth.
The Most Important Thing
How this book uses it: What an asset is actually worth based on fundamentals, independent of current price.
The Warren Buffett Way
How this book uses it: The discounted present value of future owner earnings. If price is below this, you have margin of safety.