Crude from Canada's Alberta oil sands brings about $65, a large discount from the $115 for Brent crude and the $97 price in the U.S. The increase in U.S. oil output is causing a surplus in the U.S., reducing demand for Canadian crude. The lack of enough pipelines to bring this crude to the U.S. also affects prices. The $50 discount to Brent crude affects Canada's oil revenues and economic growth. Canada's central bank cut the growth rate forecast for 2013 to 2% from 2.3%. This is also likely to weaken Canada's currency.