One of the advantages of exchange-traded funds is their low expense ratios. However, some industry analysts have suggested that companies could increase these fees given the added benefits that exchange-traded funds offer. The fund companies that offer exchange-traded funds disagree, however, and maintain that they have no plans to raise the funds' fees any time soon.

"ETFs add a lot more value to investors, whether institutional or retail," said Erik Liik, senior vice president and exchange-traded fund specialist at Funds Distributor of Washington D.C. "I think the managers or sponsors of the products should charge for those extra, added benefits. They don't have to go to this fee compression area."

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