Explain what happens to contributions to GDP in each of the following situation.
(a). a woman who makes a living charging for investment advice on her Internet Web site marries one of the clients, to whom she now provides advice at no charge.
(b). a tennis player wins two top professional tournament as an unpaid amateur, meaning the tournament sponsor does not have to pay out his share of prize money.
(c). a company that had been selling used firearms illegally finally gets around to obtaining an operating license and performing background checks as specified by law prior to each gun sale.