Why must a perfect rival ask the market price for their good, in your own words? What would happen if that company increased its pricing by even one penny ($0.01) over what the market would bear? Aquariums cost $20 each and are offered by the perfect rival, The AAA Aquarium Co. $20 is spent on fixed production costs. The total variable costs for one aquarium are $20, two aquariums are $25, three aquariums are $35, four aquariums are $50, and five aquariums are $80. Calculate the missing total, marginal, total cost, marginal, and profit numbers in the table below.

Quantity (Q)	Total Revenue (TR) = sum of marginal revenues	Marginal Revenue (MR) =(change in TR)/(change in Q)	Fixed Cost (FC) (this value must be given in the data)	Variable Cost (VC) (this value must be given in the data)	Total Cost = FC + VC	Marginal Cost (MC) =(change in TC)/(change in Q)	Profit =TR-TC
1	$20	$20	$20	$20	$40	$20
2	$40	$20	$20	$25		$5	-$5
3	$60		$20	$35	$55	$10	$5
4	$80	$20	$20	$50	$70		$10
5		$20	$20	$80	$100	$30	$0

What is the perfect rival AAA Aquarium Co.'s output quantity to maximize profits? Why, in your opinion, does a monopoly firm's demand curve slope upward more than a completely competitive firm's? A monopolist will have the option of selecting a quantity and price combination that maximizes the firm's profit. What three stages does a monopolist take to calculate their greatest profit? The cost and demand curves for a monopolist are depicted in the picture below. This can be contrasted with OpenStax's figure 9.6.