Shu-Yi Oei and Diane Ring are terrific tax scholars and they join here and step out of the tax ring.  Income share agreements have proliferated, especially in the United States.  If you don’t know what I’m referring to, you definitely need to read “Human Equity? Regulating the New Income Share Agreements“.  Oei and Ring argue against a common regulatory frame for ISAs, largely on the grounds that they are diverse in form and that sensible analogies can be drawn to other regulated instruments.  If you care about regulatory theory or about the structure or normative justifications for ISAs, the piece is great reading.