NEW YORK - Even though exchange-traded funds are among the largest 10 index funds in each major asset class and make up 10 percent of all index funds, fund companies are wary of offering the product, according to one industry executive.

Companies may be hesitant to offer them because of the extensive regulatory requirements that can delay their development, said Deborah Fuhr, vice president and head of global marketing for Morgan Stanley Dean Witter. They are also still relatively new products and are not closely tracked by the fund industry, she said.

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