Ratification is tied to collective GDP.
As there is significant push back in some signatory countries, it’s reasonable to assume at least one will fail to ratify the agreement. This is the mark everyone will be watching. In that event, the agreement can still come into force if at least six countries, which between them represent at least 85 percent of the total GDP of the original 12, have ratified it within two years.The TPP will truly be decided between the United States and Japan, which together represent just under 80 percent of the total GDP of the signatories. As Ankit Panda noted in October, “Basically, the TPP can’t come into force if either of these states fail to ratify the agreement in their domestic legislatures because there would be no way for the remaining signatories to fulfill the 85 percent of GDP requirement (even if the United States and all states but Japan ratify, the eleven would stand at 83 percent of GDP).”
http://thediplomat.com/2016/02/tpp-the-ratification-race-is-on/
And what happens if Indonesia and Thailand join in?
Complicated.
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