Stanley Fischer offered a word to the wise in 2014 that resonates today as he and other Federal Reserve officials face their toughest decision in years — the benefits of waiting can be overrated. Slowing economic growth abroad and volatile stock prices at home are prompting some U.S. central bankers to rethink whether now is the best time for the first interest-rate increase since 2006. One option, says former Fed Vice Chairman Donald Kohn, would be to put off a move at this week’s meeting to get a clearer view of the outlook.