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The Fed's fight against inflation has led to high mortgage interest rates, cooling housing demands. As demand falls, Ivy Zelman, a real-estate anaylist, said national home prices could fall by 20%. Zelman's view is more bearish compared to that of her peers, who mostly forecast single-digit drops.For months, homebuyers and real-estate experts have debated the merits of a possible housing crash following the dramatic housing boom durig the...