As the ETF industry has grown by leaps and bounds in recent years, continued innovation has enabled investors to achieve more granular exposure than ever through exchange-traded products. Diversified ETFs targeting relatively narrow sectors of the domestic and global economy have multiplied, including funds targeting the airline, gaming, insurance, gold mining, timber, and food and [...] Related Stories: Biotech ETFs Surge Again On M&A News Biotech ETFs Get Big Boost From HGSI Will Obamacare Put Healthcare ETFs On Life Support?