Jumbo loans - those too big for Freddie Mac and Fannie Mae to buy - are costlier than conforming loans and less uniformly priced, according to a new Freddie Mac study.

Among 76 lenders polled, interest-rate quotes for a 30-year fixed-rate jumbo ranged from 7.88% to 8.88%, Freddie Mac said. In contrast, loans that conform to the size requirements for sale to the government-sponsored enterprises have rates that "are consistently uniform from lender to lender and region to region," Freddie said.

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