It is not clear the additional expense and higher complication rate of the new gadget is worth it for all heart patients, doctors say.

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"Most spine devices are of uncertain efficacy and probably add to the complication rate, " says internist Richard Deyo at the University of Washington.

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The complication, of course, is that the federal funds rate is essentially at its lower bound, which means that we cannot do more simply by turning that dial further.

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Another potential complication is how the growing burden of financing the dividend could impact the dividend growth rate going forward.

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