S&P/TSX composite up as BoC cuts key rate, U.S. stock markets dip as Fed holds / TSX, U.S. markets sink as Fed forecasts fewer interest rate cuts ahead / Fed rate cuts can boost this trade that's a seasonal winner, Tom Lee says / S&P/TSX composite down, U.S. stock markets also lower ahead of Fed decision / S&P/TSX up almost 300 points as oil prices rise; Wall St. rallies and Fed holds rates / TSX posts small gain, U.S. markets rise ahead of Fed rate meeting and earnings