True, Saudi & ND / TX shale oil are high quality where Canada's oil sands and Venezuela are not. Although it is very cheap for SA to produce oil, shale is getti

True, Saudi & ND / TX shale oil are high quality where Canada's oil sands and Venezuela are not. Although it is very cheap for SA to produce oil, shale is getting cheaper (which has made the oil sands less desirable). The recent OPEC agreement to limit oil just doesn't seem to be working.