New industry and growth in population and economy have helped make Tucson, Ariz., the fastest-rising city on the Mortgage Bankers Association's Hot Mortgage Market Index.

The ranking, which gauges the potential for mortgage market opportunity in 80 metro areas, put Tucson at the 13th spot, up from 54th in 1997. Brian Carey, economist for the association, said the gain is directly attributable to population and household growth rates.

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