Benjamin Graham taught the philosophy of "value investing"--Which shields investors from substantial error and teaches them to develop long-term strategies. Over the years, market developments have proven Graham's strategies. While preserving Graham's original text, this revised edition includes updated commentary by financial journalist Jason Zweig, whose perspective incorporates the realities of today's market, draws parallels between Graham's examples and today's financial headlines, and gives readers a more thorough understanding of how to apply Graham's principles.