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Sorry, Jack: The new business rules
Jack Welch's philosophy doesn't always reign. Four top CEOs reveal what it takes to run their companies in today's environment.
By Betsy Morris, Fortune senior writer

NEW YORK (Fortune) -- For two decades, the management philosophy of ex-GE CEO Jack Welch has been the holy grail of business practice.

Now, globalization, market volatility and the flood of new, disruptive technologies are forcing changes in both practice and mindset. Recently, Fortune talked to four influential CEO's, plus Jack Welch himself, about what's different about running a business today.

Their answers, about everything from the importance of market share to the role of shareholders, may surprise you.

For a photo gallery and their comments, click on the links below.

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