ECON 1 Lecture Notes - Lecture 19: Sunk Costs, Variable Cost, Opportunity Cost

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18 Nov 2018

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An industry in the long run equilibrium, every firm in industry has zero profits zero profit condition. Short run equilibrium: fixed factors of production. Short run: a period of time during which only some decisions can be changed. Long run: a period of time long enough to allow all decisions to be changed. Stage 1 (long run) decide whether to rent restaurant space. Some costs are fixed in short run. You have already paid overhead (sunk cost), not drawn into the supply curve! Decisions can"t be changed in the short run. Profit for a restaurant: 4* 4 = . If firms lose , regret decision to open. Suppose just 1 restaurant, what is the profit? () Suppose 2 restaurants, what is the profit? () Suppose 3 restaurants, what is the profit? () If there are 4 restaurants, one would leave in the long run. How many restaurants will be open in a long run equilibrium? (3)

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Question:

Is it true that in a short-run production process, the marginal cost curve eventually slopes upward because firms have to pay workers a higher wage rate as they produce more output? Explain your answer.

Answer:

According to the definition of the short-run in Investopedia, the short-run, in economics, expresses the concept that an economy behaves differently depending on the length of time it has to react to certain stimuli. The short-run does not refer to a specific duration of time but rather is unique to the firm, industry, or economic variable being studied. A key principle guiding the concept of short-run and long-run is that in the short-run, firms face both variable and fixed costs, which means that output, wages and prices do not have full freedom to reach a new equilibrium. Most businesses make decisions not only about how many workers to employ at any given point in time (i.e. the amount of labor) but also about what scale of an operation (i.e. size of factory, office, etc.) to put together and what production processes to use. In contrast, economists often define the short-run as the time horizon over which the scale of operation is fixed and the only available business decision is the number of workers to employ. Technically, the short-run could also represent a situation where the amount of labor is fixed and the amount of capital is variable, but this is fairly uncommon. The logic is that even taking various labor laws as given, it's usually easier to hire and fire workers than it is to significantly change a major production process or move to a new size of factory or office. In the short-run, one factor of production is fixed, e.g. capital. This means that if a firm wants to increase output, it could employ more workers, but not increase capital in the short-run (it takes time to expand.) Therefore in the short-run, we can get diminishing marginal returns, and marginal costs may start to increase quickly. Also, in the short-run, we can see prices and wages out of equilibrium, e.g. sudden rise in demand, may lead to higher prices, but firms don't have the capacity to respond and increase supply.

Tejvan Pettinger. (2015). Short-run, long-run, very long-run. Glossary Terms. Economics help blog. NY: Helping to Simplify Economic.
Retrieved from: http://www.economicshelp.org/blog/glossary/short-run-long-run-very-long-run/
Short-Run. Short-Run Definition | Investopedia
Retrieved from http://www.investopedia.com/terms/s/shortrun.asp#ixzz4KO1YXsri

I need a peer reply for this, please.

taupeswan96

1- All of the following statements apply to a purely competitive market in the long run, except:

A- In the long run, all inputs are variable in quantity.

B- Firms can expand their plant capacities in the long run.

C- Total fixed costs remain constant even when output expands in the long run.

D- Firms may enter or leave the industry in the long run.

2- Which of the following is true of normal profits?

A- They are necessary to keep a firm in the industry in the long run

B- They are zero under pure competition in the long run

C- They are excluded from a firm's costs of production

D- They are what attract other firms to enter an industry

3- -The long-run supply curve would be perfectly elastic when:

A- An increase in demand does not cause a change in product price

B- An increase in demand causes an increase in product price

C- A decrease in demand causes an increase in short-run supply

D- A decrease in demand causes an increase in product price

4- What happens in a decreasing-cost industry when some firms leave and the industry's output contracts?

A- The average cost will increase

B- The average cost will decrease

D- The total cost will decrease

C- The product price will decrease

5- Which of the following statements about a competitive firm is correct?

A-To maximize profits a competitive firm should produce at that output at which total revenue is greatest

B- In long-run equilibrium a competitive firm will produce at the point of minimum average costs

C- A competitive firm will produce in the short run so long as total receipts are sufficient to cover total fixed costs

D-A competitive firm will close down in the short run whenever price is less than the minimum attainable average total cost

6- When there is allocative efficiency in a purely competitive market for a product, the minimum price producers are willing to accept is:

A- Less than marginal benefit

B- Greater than marginal cost

C- Equal to the amount of efficiency or deadweight losses

D- Equal to the maximum price consumers are willing to pay

7- A patent is the legal right granted to a firm that allows it to:

A- Make copies of other firm's products

B- Be the sole buyer of a particular product or resource

C- Sell its new product exclusively for a set number of years

D- Be the exclusive distributor of a particular imported product

coffeeyellowjacket176

Question 1 (1 point) Question 1 Unsaved In a competitive market the equilibrium price is determined: Question 1 options: at the intersection of the firmâs demand and the market supply curves. at the intersection of the market demand and supply curves. at the intersection of the firmâs demand and marginal cost curves. so as to cover the costs of the potential firms. so as to cover the costs of the firms currently in the industry. Save Question 2 (1 point) Question 2 Unsaved If the perfectly competitive market demand for gym shoes is given by QD = 100 â P and the market supply is given by QS = 10 + 2P, then the equilibrium price and quantity will be: Question 2 options: P = 50 and Q = 50. P = 40 and Q = 90. P = 40 and Q = 60. P = 30 and Q = 70. P = 25 and Q = 75. Save Question 3 (1 point) Question 3 Unsaved A constant-cost industry is one in which: Question 3 options: input prices do not change over time. technology does not change over time. input prices and technology do not change as firms enter or exit the industry. input prices and technology do not change over time. firms have reached the maturity phase of the industryâs life cycle. Save Question 4 (1 point) Question 4 Unsaved At the profit-maximizing level of output for the monopolist: Question 4 options: total revenue is equal to total cost. total costs are minimized. total revenue is maximized. marginal revenue is equal to marginal cost. average revenue is equal to average cost. Save Question 5 (1 point) Question 5 Unsaved Craigâs Red Sea Restaurant is the only restaurant in Columbia, South Carolina, that sells Ethiopian food. The demand for Ethiopian food is given by Q = 25 â P. Craigâs costs are given by TC = 25 + Q + 5Q2. Its maximum monopoly profit is: Question 5 options: â$1. $21. $22. $24. $26. Save Question 6 (1 point) Question 6 Unsaved So long as price exceeds average variable cost, in the model of monopolistic competition, a firm maximizes profits by producing where: Question 6 options: the difference between marginal revenue and marginal cost is maximized. marginal cost equals marginal revenue. marginal revenue equals price. the difference between price and marginal cost is maximized. price equals marginal cost. Save Question 7 (1 point) Question 7 Unsaved If a firm in a monopolistically competitive industry is profit maximizing, it should choose its level of advertising such that the marginal revenue of an additional dollar of advertising: Question 7 options: is equal to the elasticity of its demand curve minus 1. is exactly $1. increases revenues by $1. is equal to 1 plus the elasticity of its demand curve. is equal to the elasticity of its demand curve. Save Question 8 (1 point) Question 8 Unsaved Firms advertise in order to: Question 8 options: build brand loyalty. appeal to the price-sensitive consumers. increase the demand elasticities of their loyal customers. shift the market supply curve to the left. shift the market demand curve to the left. Save Question 9 (1 point) Question 9 Unsaved Firms offer promotions in order to: Question 9 options: build brand loyalty. appeal to the price-sensitive consumers. increase the demand elasticities of their loyal customers. shift the market supply curve to the left. shift the market demand curve to the left. Save Question 10 (1 point) Question 10 Unsaved If the demand increases for the product of a decreasing-cost industry: Question 10 options: short-run price goes up, but long-run price falls. long-run output goes up, but long-run price may go up or down. short-run output goes up, but long-run output may go up or down. long-run output goes up, but short-run price remains constant. long-run price goes up, but short-run price may go up or down. Save Question 11 (1 point) Question 11 Unsaved If the demand increases for the product of an increasing-cost industry: Question 11 options: short-run price goes up, but long-run price falls. long-run output goes up, but long-run price may go up or down. short-run output goes up, but long-run output may go up or down. long-run output goes up, but short-run price remains constant. short-run price goes up, and long-run price goes up. Save Question 12 (1 point) Question 12 Unsaved When Pan United Airlines gives a $400 fare discount to persons with student IDs, they are practicing: Question 12 options: first-degree price discrimination. second-degree price discrimination. third-degree price discrimination. markup pricing. tying. Save Question 13 (1 point) Question 13 Unsaved When a utility charges homeowners less than big industrial users, it is practicing: Question 13 options: first-degree price discrimination. fourth-degree price discrimination. third-degree price discrimination. markup pricing. tying. Save Question 14 (1 point) Question 14 Unsaved Cereal manufacturersâ use of coupons can be partially explained by: Question 14 options: first-degree price discrimination. second-degree price discrimination. third-degree price discrimination. markup pricing. tying. Save Question 15 (1 point) Question 15 Unsaved If a firm supplies separable markets with price elasticities h1 and h2, it should set prices P1 and P2 so that: Question 15 options: P1h1 = P2h2. P1 /h1 = P2 /h2. P1(1 + 1/h1) = P2 (1 + 1/h2). P1/(1 â 1 /h1) = P2 / (1 â 1/h2). P1 = 1 â 1/h1 and P2 = 1 â 1/h2. Save Question 16 (1 point) Question 16 Unsaved If a firm supplies separable markets with price elasticities h1 = â3 and h2 = â2, it should set prices P1 and P2 so that: Question 16 options: P1 = P2. 3P1 = 2P2. 2P1 = 3P2. 2/3P1 = 1/2P2. 2P1 = 2/3P2. Save Question 17 (1 point) Question 17 Unsaved Women are often charged more than men for haircuts performed by the same haircutter. This is not considered price discrimination because: Question 17 options: women receive more consumer surplus from haircuts than men receive. haircutters claim to spend more time on womenâs hair, raising the cost of the haircut to the firm. firms make up the extra cost to consumers by giving women free samples of products. men receive more consumer surplus from haircuts than women receive. women have a lower price elasticity of demand for haircuts. Save Question 18 (1 point) Question 18 Unsaved If price is above the average variable cost but below the average total cost of a representative firm in a competitive industry: Question 18 options: there will be entry to the industry over time. there will be exit from the industry over time. the firms in the industry are just earning a normal rate of return. the firms in the industry are earning a supranormal rate of return. the industry is in long-run equilibrium. Save Question 19 (1 point) Question 19 Unsaved Joeâs T-shirts has costs given by TC = $100 + 3Q, where Q is the number of shirts. If Joe charges $5 each, the percentage markup for 100 shirts is: Question 19 options: 20%. 25%. 33%. 50%. 67%. Save Question 20 (1 point) Question 20 Unsaved In the model of monopolistic competition, there can be short-run: Question 20 options: losses or profits, but there must be profits in long-run equilibrium. profits, but there must be losses in long-run equilibrium. losses or profits, but there must be losses in long-run equilibrium. losses or profits, but there must be neither profits nor losses in long-run equilibrium. losses, but there must be profits in long-run equilibrium.

ECON 1 Lecture Notes - Lecture 19: Sunk Costs, Variable Cost, Opportunity Cost

ECON 1 Full Course Notes

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