Should You Still Invest in the Vanguard 500 ETF After Goldman's Dire Prediction?

Worried that lofty valuations could derail your portfolio? Find out what recent trends mean for long-term investors.

It's been about a year since Goldman Sachs ( GS -1.38% ) analysts predicted slow returns in the S&P 500 ( ^GSPC -0.63% ) for the next decade. Due to historically lofty stock valuations and extremely concentrated holdings in any market cap -weighted market index, Goldman's team suggested stepping away from the S&P 500 for a while. Instead of -- or in addition to -- standard index trackers such as SPDR S&P 500 Trust ( SPY -0.72% ) and Vanguard S&P 500 ETF ( VOO -0.71% ) , they suggested equal-weighted funds . The Invesco S&P 500 Equal Weight ETF ( RSP -0.95% ) would be one reasonable example.

Let's see how Goldman's bearish forec