Help, I need these answers for the economic exam

15. (05.04 MC) The purchase of an additional unit increases the price of the unit and of the existing units being purchased. This describes (3 points) O perfect competition monopolistic competition an oligopoly O a monopoly O a monopsony 16. (05.04 MC) In a monopsonistic market, firms will hire where equals marginal revenue product and pay a wage rate down to the (3 points) O demand; product price demand; supply curve marginal factor cost; product price O marginal factor cost; supply curve O supply; product price