If much of human nature comes down to a struggle between greed and fear, then the mutual fund industry is proving itself very human, at least in regards to creating exchange-traded funds.

First, the greed. Cash flows into ETFs continue to outpace cash flows into mutual funds-ironically, ETFs have gained more than $500 billion in assets over the past five years, while mutual funds have lost almost the same amount during that time-leaving mutual fund companies like Fidelity, Vanguard and Pimco eager to find ways to bring that money back to their funds, according to data from Strategic Insight.

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