It doesn't work like that.
On one side are the protections for the investors/business and on the other side are the regulatory protections such as for labor, environment, or social welfare.
So if you are an American, it depends on whether you are a US investor in the company in Mexico or if you are an American worker who lost your job to NAFTA.
It also depends on your job. If you are a sewing machine operator, its bad news because the FTA opened the US market(no tariffs). But if you work on a farm growing corn its good news because the FTA opened the market to US corn(no tariffs).
As a generality, you say that a capital market economy will produce more winners and fewer losers than say a socialist economy.
So, all modern day socialists support a capital market economy, but because even capitalism creates winners and losers, the socialists will seek political solutions to the inequities. If a worker loses his job to an FTA, then he should be entitled to govt paid retraining and if he can't find a job that pays as well as the job he lost, then he should be entitled to wage insurance paid for by the govt.
I don’t really care how “it works.” I care about protecting our sovereignty and national interest. Period.