I'll jump in. The oil sands have 30-year to 40-year production. You and I could start a business for shale oil. For $1.5 million to $2 million, we have our little fracking operation going. That money can be turned off pretty quickly. With oil sands, you're talking about billions of dollars committed and the investments are all made up front. That's why I say that once you've made the investment you have no incentive to turn it off. You've already incurred all the costs and you need the revenue to pay it back.
I would think that because of the lower upfront capital cost, the shale is going to be more vulnerable than the oil sands.