I can't speak for the UK, but in the US we've done a poor job of educating people about the economy. People vote based on talking points and rhetoric about job creation and social issues without understanding the larger picture. About NAFTA Trump said, "We will either renegotiate it, or we will break it." He claims that reinstating tariffs would bring jobs back to the U.S., but economists disagree (this from the prestigious Wharton School of Business , where Trump took some undergraduate classes). Many individuals I have talked with don’t have a general understanding of what NAFTA is, and they’re not clear about how tariffs work.
I’m not advocating a single issue vote. Both Hillary and Trump have their issues, and we can and should discuss their pros and cons. But discussion requires knowledge and a willingness to listen and learn from those we disagree with.
If your favorite candidate is throwing around terms that you don’t really understand, I strongly encourage you to dig a little deeper. Start with Wikipedia. Read the first paragraph and scan the table of contents for any pertinent sections. If the article is too long and complicated, at least scan it. Wikipedia is great because articles contain so many links you can follow for additional information, including primary sources at the bottom of the page. Or just Google “What is ____?” Followed by “Pros and cons of _____” and “Who is for/against ____?”
And please do it before you vote.
*Of course, it's not clear that anyone would have changed their vote if they had done their Googling sooner.
**This is not just a partisan issue, Bernie Sanders opposes NAFTA as well.