Can stocks justify their valuations without exceptional growth ahead?
Core argument: Sales multiples at historic highs vs. prior decades, leading to dependence on both revenue growth and margin expansion for justification.
Historic earnings multiples, looking back at profits over the last decade, appear extreme: The widely followed cyclically adjusted price/earnings ratio mapped by Robert Shiller of Yale University is at its highest since September 2000, exceeding even where it was on the eve of the Great Crash in 1929. But earnings forecasts have been through a dramatic surge in the last three months. If current profit forecasts are accurate, there is indeed some room for multiples to expand a bit further. But sales multiples are by far the highest in history, so much rests on both revenues and margins delivering on their promise.

