Eric Jackson isn't worried about the fate of the bull market. The hedge fund manager behind this year's Opendoor rally is bullish in the face of Tuesday's sell-off. He recently shared why he believes the market's strength will continue. Should investors be worried about the bull market running out of steam? Eric Jackson says no, even as stocks waver on Tuesday amid fears of unsustainable valuations. Jackson, who became a retail-trader hero this summer after boosting shares of Opendoor Technologies ...