The open ended financial and investment companies, known as Exchange-Traded funds, or, ETFs engage in exchange trading that enable them to be traded anytime by duplicating a portfolio called SPY and a market sector dealing with energy, or, technology. These Exchange-traded funds are also into duplication of portfolios regarding commodities used in investment sectors, such as Gold, or, Petroleum. The boom is seen in the ETF lines of trading and the total number of Exchange-traded funds have increased in number from about 100 to almost three folds by 2006.
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