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Marginal rate of technical substitution ppt

27/11/2021 Client: muhammad11 Deadline: 2 Day

Chapter 5

Production

© 2014 Pearson Education, Inc. All rights reserved.

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Table of Contents

5.1 Production Functions
5.2 Short-Run Production
5.3 Long-Run Production
5.4 Returns to Scale
5.5 Productivity and Technology Change
© 2014 Pearson Education, Inc. All rights reserved.

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Introduction

Managerial Problem
Labor productivity during recessions
How much will the output produced per worker rise or fall with each additional layoff?
Solution Approach
First, a firm must decide how to produce. Second, if a firm wants to expand its output, it must decide how to do that in both the short run and the long run. Third, given its ability to change its output level, a firm must determine how large to grow.
Empirical Methods
A production function summarizes how a firm converts inputs into outputs using one available technology, and helps to decide how to produce.
Increasing output in the short-run can be done only by increasing variable inputs, but in the long-run there is more flexibility.
The size of a firm depends on returns to scale and its growth will be determined by increments in productivity that comes from technological change.
© 2014 Pearson Education, Inc. All rights reserved.

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5.1 Production Functions

Production Process
A firm uses a technology or production process to transform inputs or factors of production into outputs.
Inputs
Capital (K) - land, buildings, equipment
Labor (L) – skilled and less-skilled workers
Materials (M) – natural resources, raw materials, and processed products
Output
It could be a service, such as an automobile tune-up by a mechanic, or a physical product, such as a computer chip or a potato chip
© 2014 Pearson Education, Inc. All rights reserved.

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5.1 Production Functions

Production Function
Maximum quantity of output that can be produced with different combinations of inputs, given current knowledge about technology and organization
A production function shows only efficient production processes because it gives the maximum output.
q = f(L, K)
Production function for a firm that uses only labor and capital
q units of output (such as wrapped candy bars) are produced using L units of labor services (such as hours of work by assembly-line workers) and K units of capital (such as the number of conveyor belts)
Time and Variability of Inputs
Short run: a period of time so brief that at least one factor of production cannot be varied. Inputs in the short run are fixed or variable inputs.
Long run: period of time that all relevant inputs can be varied. Inputs in the long run are all variable.
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5.2 Short-Run Production

© 2014 Pearson Education, Inc. All rights reserved.

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5.2 Short-Run Production

The Marginal Product of Labor: MPL = ∆q/∆L
Change in total output resulting from using an extra unit of labor, holding other factors (capital) constant
Table 5.1 shows if the number of workers increases from 1 to 2, ∆L = 1, output rises by ∆q = 13 = 18 – 5, so the marginal product of labor is 13.
When the change in labor is very small (infinitesimal) we use the calculus definition of the marginal product of labor: the partial derivative of the production function with respect to labor [MPL = ∂q/∂L = ∂f(L,K)/∂L]
© 2014 Pearson Education, Inc. All rights reserved.

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5.2 Short-Run Production

Graphing the Product Curves
Figure 5.1 shows how output (total product), the average product of labor, and the marginal product of labor vary with the number of workers.
Product Curve Characteristics
In panel a, output rises with labor until it reaches its maximum of 110 computers at 11 workers, point C.
In panel b, the average product of labor first rises and then falls as labor increases. Also, the marginal product of labor first rises and then falls as labor increases.
Average product may rise because of division of labor and specialization. Workers become more productive as we add more workers. Marginal product of labor goes up, and consequently average product goes up.
Average product falls as the number of workers exceeds 6. Workers might have to wait to use equipment or get in each other’s way because capital is constant. Because marginal product of labor goes down, average product goes down too.
© 2014 Pearson Education, Inc. All rights reserved.

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5.2 Short-Run Production

Figure 5.1 Production Relationships with Variable Labor

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5.2 Short-Run Production

Relationships among Product Curves
The three curves are geometrically related.
Average Product of Labor and Marginal Product of Labor
If the marginal product curve is above that average product curve, the average product must rise with extra labor
If marginal product is below the average product then the average product must fall with extra labor
Consequently, the average product curve reaches its peak, where the marginal product and average product are equal (where the curves cross)
Deriving APL and MPL using the Total Production Function
The average product of labor for L workers equals the slope of a straight line from the origin to a point on the total product of labor curve for L workers in panel a.
The slope of the total product curve at a given point equals the marginal product of labor. That is, the marginal product of labor equals the slope of a straight line that is tangent to the total output curve at a given point.
© 2014 Pearson Education, Inc. All rights reserved.

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5.2 Short-Run Production

The Law of Diminishing Marginal Returns
If a firm keeps increasing an input, holding all other inputs and technology constant, the corresponding increases in output will eventually become smaller (diminish).
This law comes from realizing most observed production functions have this property.
This law determines the shape of the marginal product of labor curves: if only one input is increased, the marginal product of that input will diminish eventually.
© 2014 Pearson Education, Inc. All rights reserved.

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5.3 Long-Run Production

© 2014 Pearson Education, Inc. All rights reserved.

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5.3 Long-Run Production

Figure 5.2 A Family of Isoquants

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5.3 Long-Run Production

Substituting Inputs: MRTS=ΔK/ΔL
The slope of an isoquant shows the ability of a firm to replace one input with another while holding output constant.
This slope is the marginal rate of technical substitution (MRTS): how many units of capital the firm can replace with an extra unit of labor while holding output constant.
Diminishing MRTS (absolute value)
The more labor and less capital the firm has, the harder it is to replace remaining capital with labor and the flatter the isoquant becomes.
In Figure 5.4, the firm replaces 6 units of capital per 1 worker to remain on the same isoquant (a to b), so MRTS= -6. If it hires another worker (b to c), the firm replaces 3 units of capital, MRTS = -3.
© 2014 Pearson Education, Inc. All rights reserved.

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5.3 Long-Run Production

Figure 5.4 How the Marginal Rate of Technical Substitution Varies Along an Isoquant

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5.3 Long-Run Production

Substitutability of Inputs and Marginal Products
The marginal rate of technical substitution is equal to the ratio of marginal products
-MPL/MPK = ΔK/ΔL = MRTS
Cobb-Douglas Production Functions: q = ALαKβ
A, α, and β are all positive constants
The marginal product of labor is MPL = αq/L = αAPL and α = MPL/APL
The marginal product of capital is MP­K = βq/K = βAPK, and β = MPK/APK
MRTS = -αK/βL
© 2014 Pearson Education, Inc. All rights reserved.

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5.4 Returns to Scale

Constant Returns to Scale (CRS): f(2L, 2K) = 2f(L,K) = 2q
A technology exhibits constant returns to scale if doubling inputs exactly doubles the output. The firm builds an identical second plant and uses the same amount of labor and equipment as in the first plant.
Increasing Returns to Scale (IRS): f(2L, 2K) > 2f(L,K) = 2q
A technology exhibits increasing returns to scale if doubling inputs more than doubles the output. Instead of building two small plants, the firm decides to build a single larger plant with greater specialization of labor and capital.
Decreasing Returns to Scale (DRS): f(2L, 2K) < 2f(L,K) = 2q
A technology exhibits decreasing returns to scale if doubling inputs less than doubles output. An owner may be able to manage one plant well but may have trouble organizing, coordinating, and integrating activities in two plants.
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5.4 Returns to Scale

Varying Returns to Scale
Many production functions have increasing returns to scale for small amounts of output, constant returns for moderate amounts of output, and decreasing returns for large amounts of output.
Graphical Analysis
Figure 5.5, a to b: When a firm is small, increasing labor and capital allows for gains from cooperation between workers and greater specialization of workers and equipment, so there are increasing returns to scale
Figure 5.5, b to c: As the firm grows, returns to scale are eventually exhausted. There are no more returns to specialization, so the production process has constant returns to scale.
Figure 5.5, c to d: If the firm continues to grow, the owner starts having difficulty managing everyone, so the firm suffers from decreasing returns to scale.
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5.4 Returns to Scale

Figure 5.5 Varying Scale Economies

© 2014 Pearson Education, Inc. All rights reserved.

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5.5 Productivity and Technology Change

Relative Productivity
Firms are not necessarily equally productive
A firm may be more productive than others if: a manager knows a better way to organize production; it’s the only firm with access to a new invention; union-mandated work rules, government regulations, or other institutional restrictions affect only competitors.
Firms are equally productive in competitive markets, not in oligopoly markets
Innovation
An advance in knowledge that allows more output to be produced with the same level of inputs is called technological progress.
Technological progress is neutral if more output is produced using the same ratio of inputs. It is nonneutral if it is capital saving or labor saving.
Organizational changes may also alter the production function and increase the amount of output produced by a given amount of inputs. In the early 1900s, Henry Ford revolutionized mass production of automobiles through interchangeable parts and the assembly line.
© 2014 Pearson Education, Inc. All rights reserved.

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Managerial Solution

Managerial Problem
Labor productivity during recessions
How much will the output produced per worker rise or fall with each additional layoff?
Solution
Layoffs have the positive effect of freeing up machines to be used by remaining workers. However, if layoffs force the remaining workers to perform a wide variety of tasks, the firm will lose the benefits from specialization.
Holding capital constant, a change in the number of workers affects a firm’s average product of labor. Labor productivity could rise or fall.
For some production functions layoffs always raise labor productivity because the APL curve is everywhere downward sloping, for instance the Cobb-Douglass production function.
© 2014 Pearson Education, Inc. All rights reserved.

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Table 5.1 Total Product, Marginal Product, and Average Product of Labor with Fixed Capital

© 2014 Pearson Education, Inc. All rights reserved.

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Table 5.2 Output Produced with Two Variable Inputs

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