Housing and healthcare are the two things that have little to do with trade. Housing affordability is almost entirely policy driven. In a "free" market (quoted because the definition typically doesn't take into account the necessity of a functional society to maintain property rights and values, just ask Detroit), housing affordability is entirely dependent on one's relative income and propensity to spend, i.e. you can have high absolute income (say in NYC) and still find you desired housing unaffordable. I think people intuitively understand this. Healthcare costs are more complicated but is also almost entirely a domestic issue.