The market for smoothies is perfectly competitive and the market demand schedule is in the first two columns in the below table. Each of the 100 producers of smoothies has the costs given in columns 3-6 when it uses its least-cost plant. What is the market price of a smoothie? $5.25 $1.25 Market demand schedule Quantity demanded (smoothies per hour) 1,000 Price (dollars per smoothie) 1.90 2.00 2.20 2.91 4.25 5.25 5.50 950 800 700 550 400 300 Output (smoothies per hour) 3 4 5 6 7 8 9 Producers of smoothies Costs Marginal cost (dollars per additional smoothie) 2.50 2.20 1.90 2.00 2.91 4.25 8.00 Average variable cost (dollars per smoothie) 4.00 3.53 3.24 3.00 2.91 3.00 Average total cost 3.33 7.33 6.03 5.24 4.67 4.34 4.25 4.44

The table below shows the weekly marginal cost (MC) and average total cost (ATC) for Buddies, a purely competitive firm that produces novelty ear buds. Assume the market for novelty ear buds is a competitive market and that the price of ear buds is $6.00 per pair. Buddies Production Costs Quantity MC ATC of Ear Buds ($) ($) 20 1.00 25 2.00 1.20 30 2.46 1.41 35 3.51 1.71 40 4.11 2.01 45 5.43 2.39 50 5.99 2.75 55 8.47 3.27 Instructions: In part a, enter your answer as the closest given whole number. In parts b-d, round your answers to two decimal places. a. If Buddies wants to maximize profits, how many pairs of ear buds should it produce each week? pairs b. At the profit-maximizing quantity, what is the total cost of producing ear buds? 2$ c. If the market price for ear buds is $6 per pair, and Buddies produces the profit-maximizing quantity of ear buds, what will Buddies profit or loss be per week? 2$

In Problem 5, the market demand decreases and the demand schedule becomes: If firms have the same costs set out in Problem 5, what is the market price and the firm’s economic profit or loss in the short run? Problem 5 The market for paper is perfectly competitive and 1,000 firms produce paper. The table sets out the market demand schedule for paper. The table in the next column sets out the costs of each producer of paper. Calculate the market price, the market output, the quantity produced by each firm, and the firm’s economic profit or loss.  

On the graph input tool, change the number found in the Quantity Demanded field to determine the prices that correspond to the production of 0, 6, 12, 15, 18, 24, and 30 units of output. Calculate the total revenue for each of these production levels. Then, on the following graph, use the green points (triangle symbol) to plot the results.   Calculate the total revenue if the firm produces 6 versus 5 units. Then, calculate the marginal revenue of the sixth unit produced. The marginal revenue of the sixth unit produced is________.   Calculate the total revenue if the firm produces 12 versus 11 units. Then, calculate the marginal revenue of the 12th unit produced. The marginal revenue of the 12th unit produced is_________.

Paulina sells beef in a competitive market where the price is $8 per pound. Her total revenue and total costs are given in the table below. Quantity of Total revenue Total cost beef (lb.) 0 1 2 3 4 ($) 0 8 16 24 32 ($) 4 8 13 19 27 Profit ($) 0 8 pounds Marginal revenue ($) c. What is the profit-maximizing (or loss-minimizing) quantity? Marginal Marginal cost ($) profit ($) a. Complete the table. Instructions: Enter your answers as a whole number. If you are entering any negative numbers be sure to include a negative sign (-) in front of those numbers. b. At what quantity does marginal revenue equal marginal cost? pounds A

The table below shows the weekly marginal cost (MC) and average total cost (ATC) for Buddies, a purely competitive firm that produces novelty ear buds. Assume the market for novelty ear buds is a competitive market and that the price of ear buds is $6.00 per pair. Buddies Production Costs Quantity MC ATC of Ear Buds ($) ($) 25 2.20 30 2.02 2.17 35 2.45 2.21 40 3.57 2.38 45 4.00 2.56 50 5.46 2.85 55 5.93 3.13 60 8.53 3.58 Instructions: In part a, enter your answer as the closest given whole number. In parts b-d, round your answers to two decimal places. a. If Buddies wants to maximize profits, how many pairs of ear buds should it produce each week? pairs b. At the profit-maximizing quantity, what is the total cost of producing ear buds?

Suppose a profit maximizing firm in a perfectly competitive market currently pays  their employees $20 per hour. When their most recently hired employee began working at the  firm, their hourly production increased by 5 units. What price must they sell their product for?

e. Please describe the effect on quantity and price when firms have an incentive to exit the market. (Hint: the number does not matter; just clarify how quantity and price change.) Price 12 10 8 6 4 2 ○ 20 20 40 60 MC ATC 80 AVC Demand curve 100 Quantity (beach balls per day)

Consider the perfectly competitive market for sports jackets. The following graph shows the marginal cost ( MCMC ), average total cost ( ATCATC ), and average variable cost ( AVCAVC ) curves for a typical firm in the industry.

The figure below depicts the market supply and demand for the perfectly competitive rollerblade industry. S Price per pair of Rollerblades 1,140 070 50 150 Number of pairs of Rollerblades per week Based on the figure above, if the current quantity demanded of rollerblades is 150 per week, you accurately predict that in the short run, Q Select one: a. price and quantity supplied will increase and quantity demanded will decrease. b. price and quantity supplied will decrease and quantity demanded will increase. c. price, quantity supplied and quantity demanded will increase. d. price, quantity supplied and quantity demanded will decrease.