http://www.ase.tufts.edu/gdae/policy_research/TPP_simulations.html
In this TPP study, the authors find:
- TPP would generate net losses of GDP in the      United States and Japan.
 For the United States, they project that GDP      would be 0.54 percent
 lower than it would be without TPP, 10 years after      the treaty 
enters into force. Japan’s GDP is projected to decrease 0.12      
percent.
 - Economic gains would be negligible for other      participating countries –
 less than one percent over ten years      for developed countries and 
less than three percent for developing ones.      These projections are 
similar to previous findings that TPP gains would be      small for many
 countries.
 - TPP would lead to employment losses in all      countries,
 with a total of 771,000 lost jobs. The United States would      be the 
hardest hit, with a loss of 448,000 jobs. Developing economies      
participating in the agreement would also suffer employment losses, as  
    higher competitive pressures force them to curtail labor incomes and
      increase production for export.
 - TPP would lead to higher inequality,
 as      measured by changes in the labor share of national income. The 
authors      foresee competitive pressures on labor income combining 
with employment      losses to push labor shares lower, redistributing 
income from labor to      capital in all countries. In the United 
States, this would exacerbate a multi-decade      downward trend.
 - TPP would lead to losses in GDP and employment in non-TPP countries. In large part, the loss in GDP (3.77 percent) and employment (879,000) among non-TPP developed countries would be driven by losses in Europe, while developing country losses in GDP (5.24%) and employment (4.45 million) reflect projected losses in China and India.