Six of the world's 10 most innovative companies are American, according to a ranking. Firms such as Salesforce.com, VMWare and Amazon made the list due to their ability to create a culture of curiosity and experimentation, write Hal Gregersen and Jeff Dyer. "Through our research, we have noticed some warning signs when it comes to innovative leaders. Putting it bluntly, some CEOs and senior executives are so creative they squelch their employees' skills and ideas," they write.
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