Economics Chapter 1: Thinking Like an Economist

Class Size Variation:
- Introductory economics classes vary widely in size, from as few as 20 to as many as 2,000 students.
- The optimal class size, if cost were not a factor, might be just one student, allowing for tailored instruction.
- Benefits of a one-on-one format: personalized learning, tailored pace, close communication, and trust.
- Grades based on learning rather than testing luck.
Economic Trade-Offs:
- Despite the advantages of small classes, costs significantly impact the class size offered.
- Personal class could cost over $50,000.
- Larger classes reduce the cost per student, e.g., a class of 300 can cost as low as $200 per student.
- Quality vs. Cost:
  - Larger classes may compromise instructional quality but lower costs allow broader access.

LO1: Explain and apply the Scarcity Principle: more of one good means less of another, due to limited resources.
LO2: Explain and apply the Cost-Benefit Principle: an action is rational if its benefit equals or exceeds its cost.
LO3: Discuss inconsistency pitfalls in applying the Cost-Benefit Principle.
LO4: Explain and apply the Incentive Principle: understanding incentives is key to predicting behavior.

Definition of Economics:
- Study of how people make choices under scarcity and its societal implications.
Scarcity Principle:
- No-Free-Lunch Principle: Resources are limited; having more requires giving up something else.
Trade-offs as Core Idea: Choice involves compromise and prioritization of competing wants.

Cost-Benefit Principle:
- Take action if extra benefits at least match extra costs.
Analyzing Class Size Decisions:
- Example: if a 20-student class costs $1,000 more than a 100-student class, switch only if the educational improvement is valued at $1,000 per student.
Value of Smaller Classes Influenced by Income:
- Wealthier students often support smaller classes reflected in private resources and tuition levels.

Example 1: Should you walk downtown for a $10 discount?
- Benefit of buying downtown: $10 saved.
- Cost of the trip: Assign a monetary value based on alternative opportunities (e.g., hypothetically earning $1,000 to drop off a package).
- Decision: Downtown if benefit exceeds cost (e.g., Cost of trip <$10).
Economic Surplus Defined:
- Difference between benefits and costs; maximizing surplus is rational.

Definition:
- The value of what must be given up to engage in an activity.
Application to Decisions:
- Example: Going to a movie incurs not only ticket price but also forgone earnings from jobs (e.g., dog walking).
Analyzing Implicit Costs:
- Recognize that poor decisions often ignore these.

Pitfalls Identified:
1. Measuring Costs/Benefits Wrongly:
- Proportions vs. absolute amounts leads to faulty reasoning (e.g., thinking $10 vs. $2,020 should differ in decision-making).
1. Ignoring Implicit Costs:
- Not accounting for what is forgone (e.g., lost time from study or leisure).
1. Failing to Think Marginally:
- Only considering marginal costs and benefits when making decisions instead of sunk costs.

Definition:
- People are more likely to undertake an action if its benefit increases or its cost decreases.

Microeconomics:
- Focuses on individual choices and group behavior in markets.
Macroeconomics:
- Studies performance of national economies and policy impacts.

Core Ideas:
- Focus on a concise list of principles (Scarcity, Cost-Benefit, Incentive) to analyze economic behavior effectively.
Active Learning:
- Engage with materials through examples, self-tests, and applications to reinforce concepts.
Economic Naturalism:
- Observing and applying economic insights to real-life decisions and behaviors.

Scarcity Principle: More of one good means less of another due to limited resources.
Cost-Benefit Principle: Take action if benefits exceed costs.
Incentive Principle: Actions are taken based on the changed benefits or costs.