T. Rowe Price plans to team up with Goldman Sachs to sell private-market investments. - Bing Guan/Bloomberg News Active stock pickers always seem to be running out of road—and now face the rise of private-market investments. For all the gloom though, they still have room to maneuver. Funds that choose what stocks and bonds to buy and sell have come under increasing pressure from index funds. Not only are those “passive” options tough to beat these days, thanks to an ever-rising S&P 500, but they also typ ...