Technology, Production, and Costs: Microeconomics Chapter 11 Study Guide

Technology, Production, and Costs

11.1 Technology: An Economic Definition

Technology in economics refers to the processes a firm uses to turn inputs into outputs of goods and services. Technological change occurs when a firm improves or worsens its ability to produce a given level of output with a given quantity of inputs.

• Technology: The process by which a firm transforms inputs (such as labor, machines, and natural resources) into outputs.

• Technological change: A positive or negative change in a firm’s ability to produce output with a given quantity of inputs.

• Example: Fracking is a positive technological change that increased oil production and lowered costs.

11.2 The Short Run and the Long Run in Economics

Economists distinguish between the short run and the long run based on the flexibility of inputs. In the short run, at least one input is fixed, while in the long run, all inputs can be varied.

• Short run: Period during which at least one input is fixed (e.g., a factory lease).

• Long run: Period in which all inputs can be changed, technology can be adopted, and the size of the physical plant can be altered.

• Fixed costs: Costs that remain constant as output changes.

• Variable costs: Costs that change as output changes.

• Total cost: The sum of all costs incurred in production.

Implicit Costs Versus Explicit Costs

Economists consider both explicit and implicit costs when analyzing firm decisions. Explicit costs involve direct monetary payments, while implicit costs represent opportunity costs of resources used.

• Explicit cost: A cost that involves spending money (e.g., wages, rent).

• Implicit cost: A nonmonetary opportunity cost (e.g., foregone salary, interest on savings).

• Example: Jill Johnson’s pizza store includes explicit costs (equipment, wages) and implicit costs (foregone salary, economic depreciation).

11.3 The Marginal Product of Labor and the Average Product of Labor

The marginal product of labor measures the additional output from hiring one more worker, while the average product of labor is the total output divided by the number of workers. Specialization and division of labor can increase productivity, but eventually diminishing returns set in.

• Marginal product of labor: The additional output produced by hiring one more worker.

• Average product of labor: Total output divided by the number of workers.

• Law of diminishing returns: Adding more of a variable input to a fixed input will eventually cause the marginal product to decline.

• Example: Adam Smith’s pin factory: division of labor increased output dramatically.

11.4 The Relationship Between Short-Run Production and Short-Run Cost

Marginal cost is the change in total cost from producing one more unit. Average total cost is total cost divided by output. The relationship between these costs is central to understanding firm behavior.

• Marginal cost (MC): $MC = \frac{\Delta TC}{\Delta Q}$

• Average total cost (ATC): $ATC = \frac{TC}{Q}$

• U-shaped ATC curve: Average total cost falls at low levels of production, then rises at higher levels due to diminishing returns.

11.5 Graphing Cost Curves

Cost curves illustrate the relationships between different types of costs. Average total cost, average variable cost, average fixed cost, and marginal cost are key curves in microeconomics.

• Average fixed cost (AFC): $AFC = \frac{FC}{Q}$

• Average variable cost (AVC): $AVC = \frac{VC}{Q}$

• Marginal cost (MC): Cuts through ATC and AVC at their minimum points.

• ATC curve: The vertical sum of AVC and AFC curves.

11.6 Costs in the Long Run

In the long run, all costs are variable. The long-run average cost curve shows the lowest possible cost for producing each level of output when no inputs are fixed.

• Economies of scale: Long-run average costs fall as output increases.

• Minimum efficient scale: The lowest output level at which economies of scale are exhausted.

• Constant returns to scale: Long-run average cost remains unchanged as output increases.

• Diseconomies of scale: Long-run average costs rise as output increases.

• Example: Ford’s River Rouge complex experienced diseconomies of scale due to excessive size and management difficulties.

Summary Table: Definitions of Cost

Term	Definition
Fixed Cost (FC)	Cost that does not change with output
Variable Cost (VC)	Cost that changes with output
Total Cost (TC)	Sum of fixed and variable costs
Average Total Cost (ATC)	Total cost divided by output
Average Fixed Cost (AFC)	Fixed cost divided by output
Average Variable Cost (AVC)	Variable cost divided by output
Marginal Cost (MC)	Change in total cost from producing one more unit

Relevant Image

The following image is the cover of the textbook "Microeconomics, Eighth Edition" by Hubbard and O'Brien, which is directly relevant as it identifies the source and context of the study material.