Comments on: ProShares Ultra ETFs Benefit From Market Volatility http://etf-central.com/2008/02/03/proshares-ultra-etfs-benefit-from-market-volatility/ Fast-paced market news, analysis, and discussion - Michael J. Bommarito II Sun, 15 Apr 2012 03:42:02 +0000 hourly 1 http://wordpress.org/?v=3.3.1