The discount for Canadian crude oil prices, because of higher shale oil output in the U.S. midwest and lack of enough pipeline capacity to get Canadian crude to Gulf Coast refineries, is affecting the Canadian economy. The lower price for Canadian crude was at about $20 per barrel lower than the U.S. benchmark price in April 2013. This discount has reduced Canada's GDP growth for the second half of 2012 by 0.4%, according to the Canadian central bank. The discount was as high as $40 to U.S. benchmark price for Canadian heavy crude in January and Febuary 2013. Continued discount is expected till enough pipeline capacity is created for Alberta's heavy crude to get to Gulf Coast refineries in the U.S.