Open Borders: Now Do You See What We’re Missing?

In Open Borders, I never claim that immigration restrictions make life in the First World bad.  I dont try to scare people into supporting more immigration, a la, Without more immigrants, were doomed.  What I claim, rather, is that immigration is a massive missed opportunity.  While life is fine the way it is (or was, until a month ago), there is no reason to settle for fine.  If there is a dependable way to dramatically improve our lives, we should seize it.

What then are we missing?  The...