Bethune says the Fed needs to be especially cautious in signaling any policy shift because the U.S. economy has been serving as a global engine of growth.

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Such a shift, however cautious, would be risky.

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Gutsche said the shift to reject all paper has already started, but Shane is more cautious in his predictions.

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The careful and cautious wording of its new definition suggests some private disagreements within the ECB about how far to shift.

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Ghai notes that he has been cautious on the provider of enterprise wireless networking gear ahead of an expected upgrade cycle in expectations that a shift to the higher speed 802.11ac standard could cause a pause in the market.

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