each options are they true of false for each

i. In MC, a firm's demand curve is downward sloping, where in PC it is not. ii. In MC, firms charge a mark-up over marginal cost, where in PC they do not. iii. In MC, firms have (some) monopoly power, where in PC they do not. iv. In MC, firms collude to form oligopolies & keep prices high, where in PC they do not