[Dog Gone]

Of course there are costs involved. The goal of "free trade" is the elimination of the tariffs which make trade prohibitive.

[concrete is my business]

You are right. My point is for the actual partys involved, the costs are often just shifted to a different column on the invoice. In my experience, real costs are not necessarily lowered and with Canadian-USA trade many costs have gone up. We had tons of duty free goods before NAFTA.