In this second in a series of columns, UF Levin College of Law professor and economist Neil H. Buchanan shows how much of a stretch it would be to say—as conservatives are saying—that all taxes on wealth are unconstitutional and that all progressive taxes are taxes on wealth. Professor Buchanan argues that even if the now-defunct Billionaires Tax proposed by Democrats were a tax on wealth, rather than income, that classification would still not categorically violate the Constitution.