The Leuthold Group, a research firm, calculates that share prices have risen in each of the nine worst years for profits over the past half-century.

ECONOMIST: American productivity

Megacaps' chronic underperformance has left many investors with the impression that small caps are where the action is, says Doug Ramsey, chief investment officer at Leuthold Weeden Capital Management.

WSJ: Why 'Mega-Cap' Stocks Look Good