The State Street SPDR S&P Biotech ETF (XBI) made its debut on 01/31/2006, and is a smart beta exchange traded fund that provides broad exposure to the Health Care ETFs category of the market.What Are Smart Beta ETFs?For a long time now, the ETF industry has been flooded with products based on market capitalization weighted indexes, which are designed to represent the broader market or a particular market segment.Investors who believe in market efficiency should consider market cap indexes, as they replicate ...