Robert Z. Lawrence, a Harvard economist, argues that the model used by Tufts researchers « is simply not able to credibly predict the effects of the TPP » and argues that the model used by Petri and Plummer is superior.  Lawrence argues that the model used by Tufts researchers « does not have the granularity that allows it to assess variables such as exports, imports, foreign direct investment and changes in the industrial structure. As a result, his predictions ignore the benefits to TPP economies resulting from increased specialization, economies of scale and better consumer selection.  Lawrence also notes that the model used by tufts researchers indicates that the TPP will fall by 5.24% in non-TPP developing countries such as China, India and Indonesia, which is very skeptical of Lawrence: « It is not credible that a trade agreement of this magnitude could lead the rest of the world into recession.  Harvard economist Dani Rodrik, a well-known skeptic of globalization, says that Tufts researchers « do a bad job of explaining how their model works, and the details of their simulation are a little dark… lack of sectoral and country-by-country details under Capaldo; his attitudes remain opaque; and its extreme Keynesian assumptions are agitated with its medium-term perspective.  However, Canada`s largest reserve was a conflict between the percentage of a vehicle that must come from a CPPP member country to enter duty-free, 45% less than the original TPP and 62.5% under NAFTA. Japan, a major automotive supplier, strongly supports lower requirements.  In January 2018, Canada announced that it would sign the CPTPP after receiving binding letters on culture with any other CPTPP member country, as well as bilateral agreements with Japan, Malaysia and Australia on non-tariff barriers. The Canadian Automobile Parts Manufacturers Association strongly criticized the increase in the share of auto parts that can be imported duty-free and found that the United States is moving in the opposite direction by requiring stricter import standards as part of the ongoing NAFTA renegotiations.  In February 2019, Canada`s Minister of International Trade Diversification, Jim Carr, delivered a keynote address at a seminar on CPTPP – Expanding Your Business Horizons, where he addresses companies that describe the use of the agreement as a gateway to more easily sharing people, goods and services.  On June 28, 2018, Mexico was the first country to end its internal ratification process of the CPTPP, with President Enrique Pea Nieto declaring: « With this next-generation agreement, Mexico is diversifying its economic relations with the world and demonstrating its commitment to openness and free trade. »   Donald Trump criticized the TPP agreement as too long and complicated and said, « [i]t makes 5,600 pages, so complex that no one has read it. »  Senator Bernie Sanders accused the TPP of being much more than a free trade agreement.  The TPP11 imposes rules on the supply of goods and services that exceed the relevant threshold for contracting entities in a party government. In practical terms, the agreement provides for an open tendering procedure, offers corresponding to domestic treatment and non-discrimination, as well as a fair and impartial tendering procedure.
Twelve countries participated in the TPP negotiations: the four contracting parties to the 2005 Trans-Pacific Strategic Partnership Agreement and eight other countries. All twelve signed the TPP on February 4, 2016.  The agreement would have entered into force after ratification by all signatories if this had been done within two years.