Owning a portfolio of stocks like the S&P 500 via an index fund has beaten the vast majority of professionals over the decades. Fewer than 10% of mutual-fund managers have outperformed the passive ...

After two consecutive years of more than 20% gains for the S&P 500 (^GSPC) — an achievement not seen since the late 1990s — Wall Street strategists foresee a slower pace of gains for the ...