The *huge* tax issue no one is talking about

During the debate about the Republican tax overhaul, there was quite a bit of Sturm und Drang about how the bill will exacerbate income inequality.  Well, yes, it probably will, on the margin.  It cuts marginal tax rates on the highest levels of income, and it provides lots of protections for certain types of income — like passthrough income — that will benefit more rich people than non-rich people.

But no one — including the Democrats — is talking about the main source of inequality in the t...