Concentration Risk A 'Serious Issue': Rob Arnott

Rob Arnott, chairman & founder of Syzygy Asset Management, joins Scarlet Fu and Eric Balchunas on "Bloomberg ETF IQ." A renewed wave of dip buying drove stocks toward their best day since April in the wake of a technology selloff that roiled Wall Street, with the market also gaining as oil prices fell. (Source: Bloomberg)

Rob Arnott, chairman & founder of Syzygy Asset Management, joins Scarlet Fu and Eric Balchunas on "Bloomberg ETF IQ." A renewed wave of dip buying drove stocks toward their best day since April in the wake of a technology selloff that roiled Wall Street, with the market also gaining as oil prices fell. (Source: Bloomberg)