TORONTO _ Sliding commodity prices and disappointing earnings had both Canada’s main stock index and U.S. markets closing lower Thursday. The S&P/TSX composite index closed down 75.55 points at 15,454.42. In New York, the Dow Jones industrial average ended 83.18 points to 24,664.89. The S&P 500 index closed down 15.51 points to 2,693.13 and the […]