12. A firm has a fixed cost of $100,000, and variable cost is $90,000 at an output of one. How much is marginal cost at an output of one? (LO2) a) $10,000 b) $90,000 c) $100,000 d) $190,000 e) There is insufficient information to answer the question. 13. Parkinson's law is an example of (L07) a) economies of scale b) diseconomies of scale c) Adam Smith's pin factory d) the firm's search for its most profitable output