Detailed Study Notes on Costs, Revenue, and Production Concepts

Parking Prices

  • Prices for Parking:
    • $200
    • $180
    • $180
    • $200
    • $160
    • FREE
    • $220

Location Names

  • New York Avenue
  • Tennessee Avenue
  • St. Charles Place
  • Connecticut Avenue
  • Pennsylvania Railroad
  • Virginia Place
  • Kentucky Avenue

Costs

  • Costs and Revenue Definitions:
    • Revenue = Price x Quantity
    • Profit = Revenue - Cost

Accountants vs. Economists

Accounting Profit

  • Total Revenue
  • Accounting Costs (Explicit Only)
    • Explicit Costs: Payments made for using resources of others (e.g., rent, wages, materials).

Economic Profit

  • Total Revenue
  • Economic Costs (Explicit + Implicit)
    • Implicit Costs: Opportunity costs incurred by using own resources (e.g., forgone wages, forgone rent).
    • If $ ext{EP} = 0$, then there is a normal profit.

Example of Profit Calculation

  • Kevin's Ice Cream Shop:
    • Monthly salary as accountant: $8,000
    • Revenue from selling 5,000 sundaes at $2 each and 8,000 cones at $1 each.
    • Other expenses: rent $1,000 + $9,000 (labor, ice cream, cones, etc.) + $5,000 vacation cost.
Calculations

  1. Accountants' Calculation:

    • Revenue = $18,000 (sundaes + cones)
    • Explicit Costs = $10,000 (total expenses excluding vacation)
    • Accounting Profit = $8,000

  2. Economists' Calculation:

    • Implicit Costs = $8,000 (forgone salary)
    • Economic Profit = Revenue - (Explicit Costs + Implicit Costs) = $0

Decision on Career

  • Conclusion: Kevin's income is equal in both scenarios, hence he may not necessarily return to accounting.

Production Simulation Overview

  • Class will produce paper chains in firms, using:
    • Resources: stapler, scissors, table, staples, paper
    • Durations: Each round lasts 2 minutes
  • Regulations:
    • Workers cannot stockpile slips of paper.
    • Workers cannot cut more than one paper at a time.
    • Workers can only add links on one side.
    • Each link must pass inspection.

Key Production Metrics

  • Marginal Product (MP): Additional output generated by additional labor.
  • Total Product (TP): Total output produced.
  • Average Product (AP): Output per unit of labor.
    • Formula: AP = TP / Quantity of Labor.

Stages of Returns

  1. Stage I: Increasing Marginal Returns

    • MP rising, TP increasing at an increasing rate.
    • Reason: Specialization.

  2. Stage II: Decreasing Marginal Returns

    • MP falling, TP increasing at a decreasing rate.
    • Reason: Fixed Resources.

  3. Stage III: Negative Marginal Returns

    • MP negative, TP decreasing.
    • Reason: Workers obstructing each other.

Costs of Production

  • Fixed Costs (FC): Costs that do not change with output level (e.g., rent).
  • Variable Costs (VC): Costs that change with output level (e.g., materials).
    • Example Costs: Rent, Labor, Raw Materials.

Understanding Economies of Scale

  • Economies of Scale: Reduction in average costs when production increases.
    • Example: A car manufacturer producing 50 cars incurs higher average costs than when producing 100,000 cars.

Long Run vs Short Run Costs

  • Short-run: At least one input is fixed (e.g., production capacity).
  • Long-run: All resources, including capacity, can be varied.

Shifting Costs Curves

  • Changes in Fixed Costs vs. Variable Costs will affect Average Fixed Costs (AFC) and Average Total Costs (ATC), respectively.

Graphing Production and Cost Metrics

  • Graph Relationships:
    • MC (Marginal Cost) and MP (Marginal Product) exhibit inverse relationships.
    • Marginal Costs drop when MP rises, then rise as MP decreases.