Goldman: Why 2015 could be better than we think

Traders work at the Goldman Sachs Group booth on the floor of the New York Stock Exchange.
Peter Foley | Bloomberg | Getty Images

Goldman Sachs already appears to be having second thoughts on its tepid forecast for 2015.

The firm's clients believe Goldman is overestimating how much interest rates will rise in the years ahead, strategist David Kostin said in his weekly report that summarized recent meetings with market pros.

Kostin has projected the Federal Reserve's target funds rate to hit 3.9 percent by the end of 2018. Fund managers, though, believe slow global growth and low inflation will keep the U.S. central bank in only modest hiking mode, translating to just a 2 percent funds rate in that span.