 Unlike the visas available to other countries, TN status requires no sponsorship, but simply a job offer letter.The overall benefits of NAFTA have been quantified by several economists, whose findings have been reported in several publications like the World Bank's Lessons from NAFTA for LA and the Caribbean, NAFTA's Impact on North America, and NAFTA revisited by the Institute for International Economics.They assess that NAFTA has been positive for Mexico, whose poverty rates have fallen, and real income salaries have risen even after accounting for the 1994–1995 Economic Crisis.