The correct explanation is as follows.
Evaluating the worker outcomes related to job outsourcing, affordable products, and inexpensive labor within NAFTA's goals:
NAFTA aimed to foster benefits among Mexico, Canada, and the U.S., but practical results vary across these nations.
For U.S. workers, the positives include "cheaper goods" due to imported products. However, a drawback is significant job losses from companies relocating production to Canada or Mexico, such as automobile and parts manufacturers. "Cheap labor" primarily benefits Mexico, where companies move due to lower labor costs compared to the U.S. or Canada, supported by the stronger American and Canadian currencies versus the Mexican Peso.
Currently, the legislative bodies of the three countries are reviewing a new trade agreement, the USMCA (United States-Mexico-Canada Agreement), signed on September 30, 2018, which revises NAFTA.