Production Costs Study Guide

Production Costs

Definitions

  • Production Costs encompass all expenses incurred in the production of goods and services.

Production Theory

  • Production Theory analyzes how businesses allocate resources effectively to produce outputs.

  • Key Concepts:

    • Total Product (TP)

    • Marginal Product (MP)

    • Average Product (AP)

  • Law of Diminishing Marginal Returns describes how the addition of a variable input (like labor) to fixed inputs (like land) results in smaller increases in output after a certain point.

Short Run Production Costs

  • Short Run: A period where at least one input is fixed (land and capital fixed; labor is variable).

  • Short Run Costs: Include both fixed and variable costs associated with production.

  • In the short run, businesses cannot change the scale of production but can adjust labor.

Long Run Production Costs

  • Long Run: A period where all inputs are variable; firms can change plant size and enter or exit an industry.

  • Long Run Costs: Reflect the most efficient scale of production as all resources become variable.

Economic Costs

Economic Costs Definition

  • Economic Cost: The payment necessary to obtain and retain the services of a resource.

  • It includes both explicit and implicit costs.

Explicit Costs

  • Explicit Costs: Monetary outlays for resources owned by others. These costs are direct and recorded in financial statements.

Implicit Costs

  • Implicit Costs: Opportunity costs of using self-owned resources. This includes the income that the owner foregoes by employing their resources in one venture rather than another.

  • Implicit costs incorporate the concept of normal profit, which is the minimum profit necessary for a company to stay in business.

Profit Analysis

Accounting Profit and Economic Profit

  • Accounting Profit is calculated as:

    • Accounting Profit = Total Revenue - Explicit Costs

  • Economic Profit is calculated as:

    • Economic Profit = Accounting Profit - Implicit Costs

    • To Summarize: Economic Profit = Total Revenue (TR) - Economic Costs

    • Which includes both explicit and implicit costs.

Numerical Example: Creamy Crisp Donut Company

Cost Information

  • Entrepreneur's Estimated Salary: $50,000 (Implicit Cost)

  • Annual Lease on Building: $22,000 (Explicit Cost)

  • Annual Revenue from Operations: $380,000 (Total Revenue)

  • Payments to Workers: $120,000 (Explicit Cost)

  • Utilities Costs: $8,000 (Explicit Cost)

  • Value of Entrepreneur's Talent (next best alternative): $80,000 (Implicit Cost)

  • Forgone Interest on Personal Funds: $6,000 (Implicit Cost)

Calculations

  1. Explicit Costs = $22,000 + $120,000 + $8,000 = $150,000

  2. Accounting Profit calculated as:

    • Accounting Profit = Total Revenue - Explicit Costs = $380,000 - $150,000 = $230,000

  3. Implicit Costs = $50,000 + $80,000 + $6,000 = $136,000

  4. Economic Costs = Explicit Costs + Implicit Costs = $150,000 + $136,000 = $286,000

  5. Economic Profit:

    • Economic Profit = Total Revenue - Economic Costs = $380,000 - $286,000 = $94,000

Short Run and Long Run Characteristics

Short Run Characteristics

  • At least one input is fixed.

  • Firms cannot adjust all resources; typically capital is fixed while labor may be varied.

Long Run Characteristics

  • All inputs and outputs are variable allowing firms to modify scale and size according to market conditions.

  • Firms have the flexibility to enter or exit the market based on economic viability.

Production Relationships and Functions

Production Function

  • Represents the relationship between inputs (labor, capital) and output produced.

  • Expressed mathematically as:
    Q=f(L,K)Q = f(L, K) where Q is quantity of total output, L is quantity of labor, and K is quantity of capital.

  • Total Product (TP): The total output produced by the given inputs:
    Q=f(L,K)Q = f(L, K)

Marginal Product of Labor (MPL) and Average Product of Labor (APL)

  • Marginal Product of Labor (MPL): Change in total product due to an additional unit of labor.
    MPL=racΔTPLΔLMPL = rac{ΔTPL}{ΔL} and
    MPL=racΔQΔLMPL = rac{ΔQ}{ΔL}

  • Average Product of Labor (APL): Average output per unit of labor.
    APL=racQLAPL = rac{Q}{L}

Examples of Marginal Product




  • Example: Pamphlet-Making Production Data


    L

    Q

    MPL



    0

    0

    ----



    1

    100

    100



    2

    250

    150



    3

    450

    200






    Law of Diminishing Returns




    • This law states that as more resources (specifically labor) are added to fixed resources (such as capital), the marginal product will eventually decline.

    • Diminishing returns occur because resources are of equal quality, technology remains constant, and the gains from specialization are exhausted after a certain point.

    Average Product Calculation

    Average Product Data

    • The Average Product (APL) can be calculated from the total output divided by the number of labor units used. Given outputs are represented in a similar tabular format, demonstrating the correlation between labor (L), total quantity of output (Q), and the marginal product.

    Stages of Production

    • Stages include:

      1. Increasing Marginal Returns

      2. Diminishing Marginal Returns

      3. Negative Marginal Returns

    • Graphical Representation accounts for changes in Total Product, Marginal Product, and Average Product across stages of production where marginal product plays a central role in determining the efficiency of labor input.