On a substantive basis, I don’t know if I favor this or not. But before I spend any time thinking about it, can someone tell me if it’s even constitutional? The 16th Amendment allows the federal government to levy direct income taxes, even if the income is derived from real or personal property, but a direct federal tax on property itself is still forbidden by the Constitution unless it’s proportional to the population of each state—which I’m sure is something Warren doesn’t have in mind.