Rob Natelson (Independence Institute) is guest-blogging at Volokh Conspiracy on the Constitution's financial terms:
The Constitution’s financial terms, part I: Taxes vs. non-taxes
The Constitution’s financial terms, part II: Duties, imposts, excises and tonnage
The Constitution’s financial terms, part III: Direct and indirect taxes
The Constitution’s financial terms, part IV: The apportionment rule
The posts are based on his forthcoming article What the Constitution Means by “Duties, Imposts, and Excises”—and “Taxes” (Direct or Otherwise).
Posted at 6:26 AM