How the market's forgotten stocks could lead a 'once-in-a-generation' buying opportunity

• A once-in-a-generation opportunity is coming for the stock market, according to investment chief Richard Bernstein.
• That's because profits are about to accelerate for companies throughout the stock market.
• It could usher in a decade of sagging returns for current market leaders, and huge gains for the rest of the market. 

Brace for a big investing opportunity that's about to come for stocks — and not in an area of the market investors may be expecting. 

That's according to Richard Bernstein, the CIO of Richard Bernstein Advisors, a $16 billion asset manager.