Law Of Diminishing Returns Case Study

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Firms have many costs associated with their production output levels. These include fixed, variable costs and total costs, which is a summation of the former two. As the names suggest, a fixed cost does not alter with the output level, whereas the variable cost does. The equation linking these three are;
Costs can be given either in the long run or the short run. The short run is a period of time where at least one of a firm’s inputs is fixed. On the other hand, the long run is a period of time where all inputs are variable. (Mansfield et al., 2003).

A cost function is a mathematical formula used to calculate costs at a specific level of output. Firms may want to use a cost function so they are able to forecast their production expenses. …show more content…

In this case, the firm needs to increase the amount of labour workers. Increasing capital wouldn’t increase output levels, as it is a fixed cost. However, if the firm continues to increase the number of workers, it will eventually get to a point where each additional worker will produce a smaller return. This is called the law of diminishing returns. (Salvatore, 2002). This law of diminishing returns helps to explain the shape of the variable cost curve, so it also explains the shape of the average variable cost curve. In graph 3, the variable cost curve is shown to have …show more content…

So, the firm will designate the medium machine size to produce q2 and the small machine size to produce q1. The firm makes these decisions to reduce the cost of production. This is why the long run average cost function is an envelope of all the short run average cost functions. In this example I only used 3 different sizes of machines but in real life there would multitude of different size machines, all with differing minimum average costs. (Perloff, 2014).
Graph 10 shows the equilibrium of marginal costs, average costs and the output price. Point E shows the normal profit of a firm. For a firm to survive in a competitive market it must produce this normal profit. Normal profit is sometimes called economic profit. To produce supernormal profit a firm must increase its output price level so the interception between the price level and the marginal cost curve is higher. Supernormal profit is extra profit made on top of the normal profit.

Profit cannot be maximized if the output price is below the minimum of the short run average cost curve because below this curve a firm’s costs to produce a product will be greater than what the firm sells the product

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