A new survey shows market participants are now "virtually certain" that the Federal Reserve will resume buying assets and most expect the announcement by its next meeting, reports financial news channel CNBC.

Nearly 93 percent of 70 respondents in the cable channel's survey — which included economists, fund managers and traders — expect the Fed to boost the size of its portfolio, up from 69 percent in the survey two weeks ago.

Eighty-six percent look for an announcement in November, up from 38 percent in the last survey.

Market participants forecast that the Fed will announce plans to purchase $500 billion in assets at the conclusion of the upcoming meeting, the first time the question has been asked, CNBC reported.

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