Crisis-hit Wall Street checks in to Zandi's 'impairment studio'

NEW YORK (Reuters) - When Wall Street doesn't know where the world economy is heading, it books a session at Mark Zandi's "impairment studio".Faced with a pandemic-fueled recession with few historical comparisons and a new accounting rule requiring lenders to total up expected losses even before borrowers default, scores of U.S. banks are relying on forecasts from Zandi, the chief economist of Moody's Analytics, to help with their calculations.The exercise is critical to billions of dollars in..