That is a very good point. I've given that a lot of thought, especially when you come to conflict resolution. That can be a problem. The way Mercosur works is that they have an agreement and each country has to ratify their agreement. For example, in Brazil a lot of the negotiations that were done were ratified right away, but if the congress decides to make a new law, that would supersede what was agreed before.
I see it as an issue, and I'm glad you brought it up. We will have to be dealing not as a bloc but country to country in certain instances, because, you see, all the countries are quite different in resources, in population, and in the capacity of importing and exporting.