Assume that marginal revenue equals rising marginal cost at 100 units of output. at this output level, a profit-maximizing firm's total fixed cost is $600 and its total variable cost is $400. if the price of the product is $10 per unit and the firm produces 100 units, the firm will earn an economic profit of group of answer choices a)zero. b)$400. c)$100. d)$600. e)$1000.

The former chairman of the federal reserve, alan greenspan, used the term "irrational exuberance" in 1996 to describe the high levels of optimism among stock market investors at the time. stock market indexes such as the s& p composite price index were at an all-time high. some commentators believed that the fed should intervene to slow the expansion of the economy. why would central banks want to clamp down when the economy is growing? a. to block the formation of unsustainable speculative asset bubbles. b. to curtail excessive profits in the banking system. c. to prevent inflationary forces from gathering momentum. d. all of the above. e. a and c only.