M_C. Consider a prot-maximising rm that uses two inputs: labour is variable and capital is xed in the short run. Assume that the rm currently uses the optimal (long-run) mix of labour and capital. Now suppose that the hourly wage for labour falls. in the short run, the rm '5 choice of output: (a)- (b) minimise the long run average cost of production. (c) lead to an increase in the marginal cost of production. (d) decrease both revenues and costs. but increase orot