Simply to add to that, I think there is a preference for multilateral trade rules over bilateral deals. One of the reasons for this is that a more level playing field results from the former versus a bilateral situation in which poor countries are obviously tremendously disadvantaged in bilateral negotiations with a large economy. It also contributes to a proliferation of different deals.
Most of the bilateral treaties that have been negotiated recently have been bilateral investment treaties in fact; they are not primarily about trade but about investment, with all the investment dispute problems we know about.
I guess those are the main points I have to make.