As the stock market rallies, led by the benchmark S&P 500, Moody’s Analytics chief economist Mark Zandi is sounding a note of caution.Specifically, Zandi has warned that market valuations are approaching levels last seen during the height of the Dot-com bubble, according to an X post on September 29. He pointed to revisions in U.S. GDP that showed stronger consumer spending than initially estimated, driven largely by affluent households. This spending is closely tied to rising asset values, particularly equ ...