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Hope you didn't make the big mistake of taking Michael Bloomberg's investment advice yesterday! The mayor singled out three companies, telling reporters that General Electric, Macy's and Saks were all "irreplaceable brands" and were undervalued in the current market. But with the exception of GE, which is about where it started, both Macy's and Saks are down big today. Guess a career as an investment advisor probably isn't in the cards if his re-election campaign doesn't pan out this November.