12/3/19: S&P500 Concentration Risk over 10 years

More on increasing concentration risks in the U.S. equity markets: Goldman Sachs estimates that almost 1/4 of total return to S&P500 over the last 10 years came from just 10 stocks:

Of these, Apple alone accounted for almost 1/5th of total return to S&P500. 22% of total return was accounted for by ICT sector.