According to Jeffrey A. Bader and David Dollar of the Brookings Brief, “http://www.brookings.edu/blogs/order-from-chaos/posts/2015/07/28-tpp-linchpin-asia-rebalance-bader-dollar” ,
The US government stresses the TPP success as it will get the USA embedded in the most dynamic economic zone of the world. The policy amendments from the USA perspectives are based on various pillars including economy, security and politics.
The TPP could potentially add $77 billion to the USA annual GDP, while Japan could gain up to $105 billion every year. The article points out that though China is not a current member, most of the current partners wish that China joins the cause too.
The point though is whether the joining of China is a benefit to the industries based in the bigger countries or just more to the smaller economies?
Moreover, if the bigger developing economies like India join the cause, will the TPP get its absolute goal of affecting the global trade?