It’s enormously tempting to imagine, at bubble highs, that glorious backward-looking returns, far greater than those previously implied by valuations, demonstrate that historical standards of value are outdated and obsolete. In 1934, Benjamin Graham and David Dodd described the mood surrounding the 1929 market peak, observing that investors had abandoned their attention to valuations because 'the records of the past were proving an undependable guide to investment.' For the moment, neither ...
