NAFTA has also created a mechanism between states (Chapter 20) to resolve disputes arising from the agreement. This dispute settlement mechanism has rarely been applied, in part because the NAFTA provisions overlap considerably with those of the WTO, which came into force one year after NAFTA. WTO dispute settlement has been widely used because of perceived benefits, including an appeal mechanism and a growing precedent – more than 500 cases have been opened. However, if NAFTA is revised with provisions not included in WTO agreements, NAFTA panels can be used more and their ability to function properly can be reviewed at each renegotiation. Health and plant health standards are linked to obligations related to scientifically based human health and the safety of animals and plants in the trade in agricultural products. NAFTA parties could consider obligations agreed under the proposed TPP that go beyond NAFTA and World Trade Organization obligations, such as science- and transparency-based regulatory activities, including the use of risk analyses to improve the scientific basis of the SPS regulation, notifications to importers or lot exporters selected for spS issues , or consultation mechanisms to resolve these detention cases quickly. After diplomatic negotiations in 1990, the heads of state and government of the three nations signed the agreement on 17 December 1992 in their respective capitals.  The signed agreement had to be ratified by each country`s legislative or parliamentary department. In the end, according to many experts, Mexico`s recent economic performance was influenced by non-NAFTA factors. The depreciation of the peso in 1994 stimulated Mexican exports, while competition with low-priced Chinese industry [PDF] likely slowed growth.
Non-coherent public measures, such as land reform, have facilitated the sale and emigration of farmers. Hanson of UCSD argued [PDF] that Mexico`s struggles are mainly due to domestic causes: underdeveloped credit markets, a large and low-productivity informal sector and dysfunctional regulation. Analysts agree that NAFTA has opened up new opportunities for small and medium-sized enterprises. Mexican consumers spend more each year on the U.S.