As McKinsey & Co. partners gathered in the consulting giant’s birthplace in late October, Bob Sternfels delivered a rallying cry. “We will kick some ass as we start our second century,” the firm’s top executive told the thousands of attendees. But away from the 100-year festivities in Chicago, McKinsey bosses have been conveying a more pragmatic message: It’s time to get leaner. Bloomberg's Sri Natarajan reports. -------- Watch Bloomberg Radio LIVE on YouTube Weekdays 7am-6pm ET WATCH HERE:

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