The Invesco RAFI Developed Markets ex-U.S. ETF (PXF) made its debut on 06/25/2007, and is a smart beta exchange traded fund that provides broad exposure to the Foreign Large Value ETF category of the market.What Are Smart Beta ETFs?Products that are based on market cap weighted indexes, which are strategies designed to reflect a specific market segment or the market as a whole, have traditionally dominated the ETF industry.Market cap weighted indexes offer a low-cost, convenient, and transparent way of repl ...