Revised paper posted on SSRN

I have uploaded onto SSRN a slight revision of my previously posted paper, The Two Faces of the Single Tax Principle, to reflect comments that I received at the Brooklyn conference on October 23.  The new version is available here.  The main change is that I am now more bullish about the view the bilateral tax treaty compatibility of the so-called "option Z" approach to taxing foreign source income that I discuss in the paper.