WASHINGTON — John Williams, president of the Federal Reserve Bank of San Francisco, said the decision to pull back on quantitative easing will be data dependent, but if the data continues as expected, he would "edge down" purchases later this year.

"In my view, this has to depend on the data," Williams said in an interview with CNBC Friday from Jackson Hole. "My view has basically followed more or less my expectations of how the economy would evolve since then." Williams, who doesn't vote on the FOMC this year or next, said "if the data continues to progress as we've seen, then I do agree that we should edge down or taper or purchases later this year."

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