The mortgage slump is forcing lenders to come up with ever more creative ways to get business.

A case in point is a series of one-way adjustable mortgages introduced in recent weeks. Last week First Tennessee National Corp.'s home lending unit came out with a subprime twist on this trendy product. And last month Countrywide Credit Industries of Calabasas, Calif., and New York-based Greenpoint Financial announced they will make loans with rates that can be cut if market rates fall but are capped if they rise.

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