One government-sponsored enterprise's problem could be part of another GSE's solution.

That is the idea behind a deal announced Tuesday between Fannie Mae and the Federal Home Loan Bank of Chicago. Fannie, which has been given a mandate to put a bigger priority on supporting the housing market since it was put in conservatorship last month, agreed to buy 15- and 30-year mortgages from the Home Loan bank, which had to stop buying them from its members in July.

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