# Long run average cost. ThinkEconomics: A Firm's Long Run Average Cost Curve 2018-12-23

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## Long run average total cost curve with economies and diseconomies of scale

Average Cost The average cost is the total cost divided by the number of goods produced. Economies of scale occur when an equal percentage increase in all factors of production results in a greater percent increase in output --eg. Economic cost is the sum of all the variable and fixed costs also called accounting cost plus opportunity costs. High densities of people, cars, and factories can mean more garbage and air and water pollution. In the model, total costs are linear in volume.

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## Short

Because it's going up more than it's going down, marginal cost is going to get pulled up and rise. The flat section of the long-run average cost curve in b can be interpreted in two different ways. The long run average cost is a U shaped curve. If economic profit is greater than zero, your business is earning something greater than a normal return. In fact, there are varying degrees of short run.

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## Relationship Between Short Run And Long Run Average Cost Curve

Since short-run fixed cost does not vary with the level of output, its curve is horizontal as shown here. For example, traffic congestion may reach a point where the gains from being geographically nearby are counterbalanced by how long it takes to travel. When the average cost increases, the marginal cost is greater than the average cost. If output increases by the same percent, the operations show constant returns to scale. Economists analyze both short run and long run average cost.

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## Long run average total cost curve with economies and diseconomies of scale

This price also corresponds to minimum long-run average total cost to ensure zero economic profit in the long run. The amount of materials and labor that is needed for to make a good increases in direct proportion to the number of goods produced. L} , where P K is the unit price of using physical capital per unit time, P L is the unit price of labor per unit time the wage rate , K is the quantity of physical capital used, and L is the quantity of labor used. Amazon has no retail locations; it sells online and delivers by mail. In , a cost curve is a graph of the as a function of total quantity produced.

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## Long run average total cost curve with economies and diseconomies of scale

Economies of scale mean average cost decreases as the scale increases, whereas increasing returns to scale are restricted to the physical ratio between the increase in units of output relative to proportional increase in the number of inputs used. This curve is constructed to capture the relation between marginal cost and the level of output, holding other variables, like technology and resource prices, constant. In this situation, any firm with a level of output between 5,000 and 20,000 will be able to produce at about the same level of average cost. A rise in average variable costs leads to a rise in marginal costs. } It is also equal to the sum of average variable costs total divided by Q and average fixed costs total divided by Q. You can't buy and install new machinery by next week, or sell a factory and be moved out. The classification of short-run planning is more an indication of some temporary constraint on redefining the structure of a firm rather than a period of a specific length.

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## Managerial Economics: How to Determine Long

Hence a firm stops its output at this point. An example is generation, which has no fuel expense, limited maintenance expenses and a high up-front fixed cost ignoring irregular maintenance costs or useful lifespan. In the long run, all inputs factors of production are variable and firms can enter or exit any industry or market. Notice how the average cost is decreasing and the quantity increasing till Q3, that happens due to increasing size of the plant. However, high-efficiency turbines to produce electricity from burning natural gas can produce electricity at a competitive price while producing a smaller quantity of 100 megawatts or less.

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## Long

A long-run time frame was of sufficient length that the consumer had the ability to alter her lifestyle and technology and to improve her understanding, so as to result in improved utility of consumption. The amount of marginal cost varies according to the volume of the good being produced. In the , when at least one factor of production is fixed, this occurs at the output level where it has enjoyed all possible average cost gains from increasing production. A firm can hire file clerks and secretaries to manage a system of paper folders and file cabinets, or it can invest in a computerized recordkeeping system that will require fewer employees. It is also equal to the sum of average variable costs and average fixed costs. Like short-run average cost curves, long-run average cost curves trend downward at low target production rates, although the rate of decline in the long-run average cost curve is somewhat flatter due to the ability to readjust all factors of production.

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## Why is the long run average cost curve āUā shaped?

It is known by different names such as Normal cost curve, Planning curve or Envelop curve. The short run costs increase or decrease based on variable cost as well as the rate of production. This is when the two curves cross over each other, and is linked to the law of diminishing marginal returns. It first falls and then rises, thus it is U- shaped curve. In the long run there are no fixed factors of production. Diseconomies of scale refers to a situation where as output increases, average costs increase also.

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