Introduction to Production, Profit, and Costs

Economic Simplification of Production

• Real-world production is complex, involving many inputs, pricing strategies, and future demand anticipation.

• Economic analysis simplifies this to basic relationships to understand firm decisions (quantity to produce, price to charge).

• The level of simplification is significant, viewing production from a "40,000 feet" perspective: things go into factories, things come out.

Firm Decision Making & Market Structures

• Firms decide how much quantity to produce and what price to charge.

• The answer depends on the competitive environment:

  • Monopoly (single firm).

  • Oligopoly/Duopoly (few firms).

  • Lots of firms (perfect competition).

Core Concepts and Dichotomies

• Accounting vs. Economic Profit

• Increasing vs. Decreasing Returns to Scale

• Fixed vs. Variable Costs

• Economies vs. Diseconomies of Scale

• Average vs. Marginal Cost

• These are fundamental concepts in economics.

Profit Calculation

• Profit ($\pi$): Total Revenue (TR) - Total Cost (TC)

  • $TR = Price \times Quantity$

  • If TR > TC , profit is positive.

  • If TR < TC , profit is negative (loss).

Accounting Profit

• Measures profit based on explicit costs.

• Explicit costs: Monetary payments for resources (wages, rent, intermediate goods, utilities).

• Formula: $Accounting : Profit = Total : Revenue - Explicit : Costs$

Economic Profit

• Measures profit based on explicit costs PLUS opportunity costs.

• Opportunity Cost: The value of the next best alternative given up when making a choice.

  • Definition used in class: The value of forgone opportunities (not including explicit costs already accounted for).

• Formula: $Economic : Profit = Total : Revenue - Explicit : Costs - Opportunity : Costs$

  • Alternatively: $Economic : Profit = Accounting : Profit - Opportunity : Costs$

• A positive economic profit means the current activity is better than the next best alternative.

• A negative economic profit suggests the next best alternative is more profitable.

• This concept ties into comparative advantage (follow the money: do what maximizes your earnings).

Simplified Production Process: Broom Factory Example

• Focus: How input (labor) relates to output (brooms).

• Assumptions:

  • Only labor is used to produce brooms (no intermediate goods).

  • Production exhibits increasing returns to scale at low outputs and decreasing returns to scale at high outputs.

  • There are fixed costs and variable costs.

• Fixed Costs (FC): Costs incurred even if zero units are produced (e.g., building, setup costs). Assumed $\$200$ per day.

• Variable Costs (VC): Costs that vary with the level of output (e.g., labor wages). Assumed $\$100$ per worker per day.

Total Product ($TP$ or $Q$)

• Total Product: The total output produced by a given amount of labor (or input).

• Represents the total quantity of goods produced per day.

• Generally, as labor increases, total product increases, but at varying rates.

• The Total Product curve initially increases at an increasing rate, then at a decreasing rate.

Marginal Product of Labor ($MP_L$)

• Marginal Product: The change in total output resulting from adding one more unit of input (in this case, labor).

• Formula: $MP_L = \frac{\Delta Output}{\Delta Labor} = \frac{\Delta Q}{\Delta L}$

• Units: Rooms per worker.

Returns to Scale

• Describes how output changes as inputs (scale of production) increase.

• Increasing Returns to Scale (IRS):

  • Definition: The region of production where $MP_L$ is increasing as labor (and output) increases.

  • Graphical Interpretation: The Total Product curve is concave up (slope is increasing).

  • Example: Adam Smith's pin factory where specialization leads to higher per-person output.

• Decreasing Returns to Scale (DRS):

  • Definition: The region of production where $MP_L$ is decreasing as labor (and output) increases.

  • Graphical Interpretation: The Total Product curve is concave down (slope is decreasing).

  • Example: Crowding of workers or diminishing returns to adding more of a variable input to a fixed input.

• Constant Returns to Scale (CRS):

  • Definition: The region where $MP_L$ remains constant as labor (and output) increases.

  • Graphical Interpretation: The Total Product curve is a straight line (constant slope).

• Typical production processes exhibit IRS at low levels of output and DRS at high levels, leading to a U-shaped average cost curve. This is considered a realistic assumption.