a) Marxists and Post Keynesians believe that "profit" comes out of the production of the unpaid for "surplus value" production of labor. "Neo-Rentierists" like Hudson and Keen believe that in modern capitalism a large share of unearned income from property is "rent" from financial and real estate asset price inflation. and monopoly pricing, that is a transfer unrelated to, or above and beyond, surplus value in production. Explain. b) Explain the following equation from Keen's Debtwatch Manifesto: Y + di d D = GDP + NAT