the book's central concept, the margin of safety, is reinforced time and again w/ supporting ratios and working examples, both from the 60-70s and from zweig's excellent supplements (an extremely valuable supplement to the original text, if for no other reason than to show that graham's teachings are timeless). while occasionally ratios will appear dated and no longer relevant (i.e. book value's importance has declined w/ the transition of the US eq mkt to increasing intellectual capital in a company's mkt cap), its discipline, focus and litmus tests (i.e. bond yields vs E/P ratios) still remain valid.

for the individual investor, there simply is no better book.