Fundamentals of Microeconomics, Macroeconomics, and Productive Resources, and Trade Theory

Introduction to Microeconomics and Macroeconomics

• Definition of Economics

  • Economics is defined as the study of people and the choices they make in a world of scarce resources.

• Microeconomics

  • Definition: The study of the economy at the small-scale level, examining individuals and specific markets.

  • Focus: How individuals, businesses, and governments make decisions when faced with scarcity.

• Macroeconomics

  • Definition: The study of the economy at the large-scale level, examining total output, the price level, and other aggregate measures in the economy.

  • Focus: The "big picture" or aggregate performance of the economy.

Resources and the Foundation of Production

• Definition of Resources

  • Resources are the inputs used to produce goods and services; these are also referred to as factors of production.

  • Resources are the foundation of all productive activity.

• Four Categories of Resources

  • Land: Natural resources used in production.

  • Labor: Human effort applied to production.

  • Capital: Human-made resources (machinery, tools) used to produce other goods.

  • Entrepreneurial Ability: The talent for combining land, labor, and capital to innovate and produce.

• Scarcity of Resources

  • Resources are relatively scarce in all countries, regardless of wealth.

Scarcity and the Fundamental Human Choice

• Definition of Scarcity

  • A condition that results from the inability of limited resources to satisfy unlimited wants.

  • It poses the central question of what level of wealth is needed to be totally content (acknowledging that wants are infinite).

Opportunity Cost and Alternative Valuation

• Definition of Opportunity Cost

  • The value of the next-best forgone alternative; the value of the opportunity given up when choosing one activity or opportunity over another.

  • Opportunity costs are a direct result of scarcity.

• T.I.N.S.T.A.A.F.L.

  • An acronym for "There is no such thing as a free lunch," representing the idea that every choice carries an opportunity cost.

Rational Decision Making and Its Assumptions

• The Assumptions for Decision Making

  • Self-Interest: Decision-makers act to benefit themselves.

  • Marginal Decision Making: Decisions are made based on incremental changes rather than totals.

  • Optimization: Individuals seek to make the best possible choice given their constraints.

• Defining a Rational Decision

  • A rational decision results from the comparison of marginal benefit ($MB$) and marginal cost ($MC$).

Marginal Analysis and the Optimal Level of Output

• Decision Rules

  • If $MB \geq MC$: Do it (or do more of the activity).

  • If MB < MC: Don't do it (or do less of the activity).

• Dynamics of Activity Level

  • As activity increases, Marginal Benefit ($MB$) tends to fall.

  • As activity increases, Marginal Cost ($MC$) tends to rise.

• Law of Increasing Marginal Cost

  • The more of a good or service produced, the higher the marginal cost.

  • This occurs because the most productive resources are typically used first, making additional units more expensive to produce (linked to the Law of Increasing Opportunity Cost).

• Optimal Level of Output

  • Output is optimized at the point where $(Diminishing) \, MB = (Increasing) \, MC$.

A Simple Model of Production

• Alex’s Production Schedule

  • Option 1: $0 \text{ Apples}$, $300 \text{ Oranges}$

  • Option 2: $50 \text{ Apples}$, $150 \text{ Oranges}$

  • Option 3: $100 \text{ Apples}$, $0 \text{ Oranges}$

• Clara’s Production Schedule

  • Option 1: $0 \text{ Apples}$, $200 \text{ Oranges}$

  • Option 2: $100 \text{ Apples}$, $100 \text{ Oranges}$

  • Option 3: $200 \text{ Apples}$, $0 \text{ Oranges}$

Opportunity Cost Calculations in Production

• Calculating Alex's Opportunity Cost

  • Moving from Option 1 to Option 2: Gaining $50$ apples requires giving up $150$ oranges ($300 - 150 = 150$).

  • $\text{Opportunity Cost of } 1 \text{ Apple} = \frac{150 \, \text{Oranges}}{50 \, \text{Apples}} = 3 \, \text{Oranges}$.

  • $\text{Opportunity Cost of } 1 \text{ Orange} = \frac{50 \, \text{Apples}}{150 \, \text{Oranges}} = 1/3 \, \text{Apple}$.

  • This schedule represents constant opportunity costs.

• Calculating Clara's Opportunity Cost

  • Moving between options: Gaining $100$ apples requires giving up $100$ oranges.

  • $\text{Opportunity Cost of } 1 \text{ Apple} = \frac{100 \, \text{Oranges}}{100 \, \text{Apples}} = 1 \, \text{Orange}$.

  • $\text{Opportunity Cost of } 1 \text{ Orange} = 1 \, \text{Apple}$.

• Comparative Opportunity Cost Summary

  • Cost of 1 Apple: Alex = $3 \, \text{Oranges}$; Clara = $1 \, \text{Orange}$.

  • Cost of 1 Orange: Alex = $1/3 \, \text{Apple}$; Clara = $1 \, \text{Apple}$.

Comparative Advantage and Specialization

• Definition of Comparative Advantage

  • The ability to produce a good or service at a lower relative opportunity cost than that of another producer.

• Identifying Comparative Advantage

  • In Apples: Clara has the comparative advantage (1 < 3 \, \text{oranges}).

  • In Oranges: Alex has the comparative advantage (1/3 < 1 \, \text{apple}).

• The Theory of Comparative Advantage

  • Countries and individuals gain from trade because if each specializes in what they are best suited to produce (lowest opportunity cost), the total world output can rise.

• Impact of Specialization on Total Output

  • No Specialization (e.g., each split resources): Alex ($50\,A$, $150\,O$) + Clara ($100\,A$, $100\,O$) = $150 \text{ Apples}$, $250 \text{ Oranges}$.

  • With Full Specialization: Clara produces only apples ($200$) and Alex produces only oranges ($300$).

  • Total Specialization Output: $200 \text{ Apples}$, $300 \text{ Oranges}$.

Terms of Trade: The Price of Exchange

• Definition

  • The price of one good, service, or resource in terms of another.

• Trade Conditions

  • Trade must be mutually beneficial to occur.

  • Producer (Seller) Condition: The price must be greater than the opportunity cost of the producer to make them better off.

  • Consumer (Buyer) Condition: The price must be less than the opportunity cost of the buyer to make them better off.

• Terms of Trade Example for Apples

  • Clara (Seller) Opportunity Cost: $1 \, \text{Orange}$.

  • Alex (Buyer) Opportunity Cost: $3 \, \text{Oranges}$.

  • Target Range: The price of $1 \text{ Apple}$ must be between $1 \text{ and } 3 \text{ Oranges}$.

  • Acceptable Price: $1 \text{ Apple for } 2 \text{ Oranges}$.

Gains from Trade: A Case Study

• Clara’s Post-Trade Position

  • Without Specialization: Clara consumes $100 \text{ Apples}$ and $100 \text{ Oranges}$.

  • Specialization: Clara produces $200 \text{ Apples}$.

  • The Trade: Clara trades away $60 \text{ Apples}$ to Alex in exchange for $120 \text{ Oranges}$ (Terms: $1:2$).

  • Final Consumption: Clara has $200 - 60 = 140 \text{ Apples}$ and $0 + 120 = 120 \text{ Oranges}$.

  • Gain: Clara consumes $40 \text{ more apples}$ and $20 \text{ more oranges}$ than she could have alone.

• Alex’s Post-Trade Position

  • Without Specialization: Alex consumes $50 \text{ Apples}$ and $150 \text{ Oranges}$.

  • Specialization: Alex produces $300 \text{ Oranges}$.

  • The Trade: Alex trades away $120 \text{ Oranges}$ in exchange for $60 \text{ Apples}$.

  • Final Consumption: Alex has $0 + 60 = 60 \text{ Apples}$ and $300 - 120 = 180 \text{ Oranges}$.

  • Gain: Alex consumes $100 \text{ more apples}$ and $30 \text{ more oranges}$ than he could have alone.

• Conclusion

  • Specialization and trade shift consumption outside of the individual's Production Possibilities Frontier (PPF), making "the impossible, possible."

The Law of Increasing Opportunity Costs

• Definition

  • Because resources are better suited to producing one good or service than another, as the production of a specific good increases, the opportunity cost of each additional unit rises.

• Michael’s Production Schedule (Non-Constant OC)

  • Option 1: $0 \text{ Apples}$, $500 \text{ Oranges}$.

  • Option 2: $80 \text{ Apples}$, $400 \text{ Oranges}$ ($OC = 100 \, O / 80 \, A = 1.25 \, O/A$).

  • Option 3: $150 \text{ Apples}$, $300 \text{ Oranges}$ ($OC = 100 \, O / 70 \, A \approx 1.43 \, O/A$).

  • Option 4: $190 \text{ Apples}$, $200 \text{ Oranges}$ ($OC = 100 \, O / 40 \, A = 2.5 \, O/A$).

  • Option 5: $200 \text{ Apples}$, $100 \text{ Oranges}$ ($OC = 100 \, O / 10 \, A = 10 \, O/A$).

  • Option 6: $205 \text{ Apples}$, $0 \text{ Oranges}$ ($OC = 100 \, O / 5 \, A = 20 \, O/A$).

  • As Michael produces more apples, he must give up increasing amounts of oranges.

Circular Flow Model

• Definition

  • A model that describes how goods, services, resources, and money flow back and forth in an economy.

• Market Components

  • Resource Market: Households sell resources (inputs like labor/land) to businesses.

  • Goods and Services Market: Businesses sell products (outputs) to households.

• Specific Flows

  • Resources flow from Households to the Resource Market to Businesses.

  • Goods and Services (Products) flow from Businesses to the Goods and Services Market to Households.

  • Money flows in the opposite direction of the physical items (e.g., households pay for goods and receive income for resources).

Questions & Discussion

• Questions for Thought

  • What level of wealth would you need to achieve to be totally content and want nothing more?

  • Comparison: How many of you would choose city night life over skiing in the mountains? How many would choose the opposite?

  • Hypothetical decision making: If a jacket was worth $2$ dollars to you and it cost $20$ dollars, would you buy it? (Implicitly illustrates MB < MC).

• Discussion Questions

  • Terms of Trade: Discuss the impact of different opportunity costs between countries. Example: If the U.S. opportunity cost for $1 \text{ ton of wheat}$ is $2 \text{ tons of corn}$, and Germany's cost for the same wheat is $1 \text{ ton of corn}$, how will they negotiate?

  • Rational Decision Making: Define the concept and relate it to $MB$ and $MC$ decision making.

  • Specialization: Define specialization and discuss how it leads to interdependence and trade.

  • PPF Significance: Discuss why the PPF is important to economics. Include opportunity costs, scarcity, $MB, MC$, and efficient production.

  • Increasing OC: Why do opportunity costs for society increase when moving along the PPF?

  • Circular Flow: Compare and contrast the two markets. In which market are businesses sellers vs. buyers? In which market are households sellers vs. buyers?

• Quiz Questions

  1. Microeconomics focuses on… (Answer: How governments, individuals, and businesses make decisions when faced with scarcity).

  2. Resources are… (Answer: Relatively scarce in all countries).

  3. A rational decision results from… (Answer: The comparison of marginal benefit and marginal cost).

  4. Michelle will purchase a new phone if… (Answer: The marginal benefit of the phone is greater than its marginal cost).

  5. Main significance of equilibrium between MB and MC is… (Answer: A rational decision has been made).

  6. A production possibilities frontier (PPF) illustrates… (Answer: Opportunity cost).

  7. Theory of comparative advantage states countries gain from trade because… (Answer: If each country specializes in producing the products it is best suited to produce, world output can rise).

  8. Estonia/Bulgaria Outputs (Estonia: 4 trombones, 400 snowshoes; Bulgaria: 2 trombones, 300 snowshoes)… (Answer: Estonia has a comparative advantage in trombones; its cost is $100 \, S/T$ while Bulgaria's is $150 \, S/T$).

  9. Which influences the terms of trade? (Answer: Different opportunity costs of the parties involved).

  10. Specialization… (Answer: Results in a more efficient use of resources).

  11. Jan’s Gym Schedule (Spending 4th hour results in grade dropping 85% to 80%)… (Answer: Opportunity cost is a $4\%$ decrease in quiz grade [actually $5\%$, though transcript lists $4\%$ as option for the specific unit choice; context shows Jan is experiencing increasing opportunity costs as she moves from $5 \rightarrow 8 \rightarrow 10 \, \text{percent loss}$]).

  12. In the circular flow diagram, which flow is correct? (Answer: Goods and services flow from businesses to the goods and services market).