Treasury Secretary Henry Paulson expressed concern Tuesday about continued housing-market problems, echoing comments made one day earlier by Federal Reserve Chairman Ben S. Bernanke. Paulson proposed regulatory changes for banks, mortgage brokers and other key financial players as a way of stemming off future housing-market woes. "This patchwork structure should be streamlined and modernized," Paulson said of the current system, where no single regulator oversees all lenders.

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