The S&P 500's CAPE ratio has averaged 22%, Goldman said. Second, market concentration is near its highest level in 100 years, Goldman said. "When equity market concentration is high, performance of the aggregate index is strongly dictated by the prospects ...

US stocks are unlikely to sustain their above-average performance of the past decade as investors turn to other assets including bonds for better returns, Goldman Sachs Group Inc. strategists said.The S&P 500 Index is expected to post an annualized nominal total return of just 3% over the next 10 years,

The S&P 500 will see a 3% annualized return during the next decade while posing a 1% advance on a real basis, according to Goldman Sachs.  The index posted an annualized total return of 13% over the past 10 years,