EC 201 Lecture Notes - Lecture 9: Marginal Revenue, Substitute Good

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lemonsnake712

26 Nov 2016

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Total cost = fixed cost + variable cost: fi(cid:454)ed (cid:272)osts in(cid:272)ludes rent, utilities, (cid:271)ook keeper"s salar(cid:455), and et(cid:272, variable costs are costs of supplies, ingredients, and etc. Average total cost = average fixed cost + average variable cost. Atc initially decrease (when afc> avc) then increases (when avc > afc) Marginal cost (mc) crosses atc at its minimum point. Competitive market is when there are many buyers and many sellers. No one individual can influence market price. Profit = total revenue total cost: profit is maximized when marginal revenue (mr) equals to marginal cost (mc) If mr>mc, one must increase quantity to raise profit. If mc> mr, one must decrease quantity to produce loss. In short terms, average revenue equals price (which is true for all firms) Marginal revenue = change in tr / change in quantity. As quantity rises by 1 unit, total revenue rises by p dollars.

Related Questions

Q1. Average total cost is equal to
a. AFC + AVC
b. AFC/total output
c. AFC/AVC
d. AVC/AFC

Q2. As output increases, the ATC
a. increases
b. decreases
c. remains constant
d. falls and then rises

Q3. Total profit is equal to
a. total revenue minus total cost
b. total revenue minus explicit cost
c. total revenue minus variable cost
d. total revenue minus marginal cost

Q4. Marginal cost crosses the
a. AVC curve at the highest point of the AVC curve
b. ATC curve at the lowest point of the ATC curve
c. AFC curve at the lowest point of the AFC curve
d. ATC curve at the highest point of the ATC curve

Q5. Wages paid are an example of an explicit cost of doing business.
a. true
b. false

Q6. Any revenue over and above total cost is labeled economic profit.
a. true
b. false

Q7. If the selling price of a product is $10, the average total cost is $8, and total sales are 5,000 units, the total profit will be
a. $5,000
b. $8,000
c. $10,000
d. $20,000

Q8. Whenever marginal revenue exceeds marginal cost,
a. profit declines if output increases
b. profit increases if output increases
c. losses increase if output increases
d. marginal revenue must be rising

Q9. Under perfectly competitive conditions, marginal revenue is
a. greater than average revenue
b. equal to average revenue
c. less than average revenue
d. equal to the average variable

Q10. A firm's break-even point occurs where
a. marginal revenue equals marginal cost
b. marginal revenue equals average variable cost
c. total revenue equals total cost
d. total revenue equals total variable cost

Q11. The addition to total output resulting from using one more unit of a productive resource is the
a. average product
b. marginal input
c. total product
d. marginal product

Q12. Unlike a firm in pure competition, a monopolist may be able to
a. block the entry of new firms into the industry
b. continue to earn economic profits in the long run
c. earn economic profits in the short run
d. both (a) and (b)

Q13. Producer surplus is the difference between the price the firm is willing to sell its goods and the price it actually receives.
a. true
b. false

Q14. In the long run, under conditions of perfect competition, market forces come into play to
a. enhance profits
b. increase demand
c. eliminate profits
d. separate MR and AR

Q15. Consumer surplus is the area above the demand curve and below the equilibrium price.
a. true
b. false

Q16. Under perfect competition, market price is determined by market demand and supply.
a. true
b. false

Q17. The more that firms advertise, the closer they get to perfect competition.
a. true
b. false

Q18. Perfect competition assumes that a producer is interested in maximizing profit.
a. true
b. false

Q19. In the long run, under conditions of perfect competition, the buyer will eventually be able to buy the product at a
a. price equal to the lowest point on the ATC curve past the optimal scale of operation
b. price below cost
c. price equal to the lowest point on the ATC curve at the optimal scale of operation
d. discount

Q20. The lowest possible ATC curve is attained at the optimal scale of output.
a. true
b. false

The spreadsheet below gives some of the production cost data. Add columns to show, respectively, average fixed cost (AFC), average variable cost (AVC), average total cost (ATC), and short-run marginal cost (SMC). Then, add columns to show, respectively, total revenue (TR), marginal revenue (MR), total profit, average profit, and profit margin.

Assume that the world market demand and supply curves for clay fire pots intersect at $190 per unit.

Q	TC	TFC	TVC
0	7,000	7,000	-
100	14,000	7,000	7,000
200	23,000	7,000	16,000
300	32,000	7,000	25,000
400	43,000	7,000	36,000
500	52,000	7,000	45,000
600	74,000	7,000	67,000
700	97,000	7,000	90,000
800	111,000	7,000	104,000
900	132,000	7,000	125,000
1000	152,000	7,000	145,000

magentahorse115

QUESTION 22

For a perfectly competitive firm, profit maximization (or loss minimization) occurs at the level of output at which

	a.	MR = MC.
	b.	MR = AVC.
	c.	P = ATC.
	d.	MR = ATC.

4 points

QUESTION 23

If MR > MC, then

	a.	profits are being maximized.
	b.	the firm is producing too much of the good to be maximizing profits.
	c.	the firm can increase its profits (or minimize its losses) by increasing output.
	d.	the firm must be incurring losses.

4 points

QUESTION 24

If firms are earning zero economic profits, they must be producing at an output level at which

	a.	price minus marginal cost.
	b.	total revenue equals total costs, in other words, normal profits.
	c.	price equals average variable cost.
	d.	marginal revenue equals marginal cost.
	e.	none of the above

4 points

QUESTION 25

In the theory of perfect competition,

	a.	the market demand curve is horizontal.
	b.	the single firm faces a horizontal demand curve.
	c.	the single firm faces a downward-sloping demand curve.
	d.	the market demand curve is downward sloping.
	e.	b and d

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EC 201 Lecture Notes - Lecture 9: Marginal Revenue, Substitute Good

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