We're spending a lot of time trying to negotiate legal language that will be binding and subject to enforceable dispute settlement. That is the primary purpose of developing free trade agreements with other countries: to have a very secure environment for investors to establish the kinds of supply chains that we've seen develop over the years in North America. It's not just supply chains, but also sourcing, product decisions, and investment decisions. All of those are much more effective on the basis of a secure environment.
With the sunset clause, you have very little security at all, because there's a constant threat that the agreement will end. I think few enterprises are going to be looking to make a long-term investment commitment in North America, and in particular in any of the three parties, if they don't have some assurance that the terms of trade are going to be predictable, so that they can know that years down the road, as their investment continues, they will be operating under the same business conditions as they were when they first started that investment. If the prospect is that the agreement will end after one of those five-year periods, all at once their investment is going to be very negatively impacted, because the conditions of trade will change entirely.