Introduction to Economics: Microeconomics, Scarcity, and Core Principles

Introduction to Economics: Microeconomics, Scarcity, and Core Principles

  • The speaker’s view of economics:

    • Not just stock market talk; economics is the science of decision making in a social context.
    • Broad and applicable to many decision-making situations beyond finance or markets.
    • Economics can be studied as a pathway to becoming a better decision maker.
    • Personal interest: learning about the stock market initially, but discovering economics is broader and not solely about markets.
    • The field is useful across different sectors: corporations, government, and beyond.
    • Economics as a toolset can analyze decisions you might not initially think are economic problems (e.g., game theory, strategic decisions).

  • Personal journey into economics:

    • Freshman year path: started as a business major, switched to economics by the end of the first year.
    • High school economics: taught in some places but not universally required; many students don’t encounter econ early.
    • The tools learned in econ have broad applicability to real-world decision making.

  • What economics studies and why it matters:

    • Economics is the science of decision making under scarcity.
    • Scarcity means there are unlimited wants but limited resources, which applies to individuals and society.
    • Scarcity creates the need to make choices about allocating resources efficiently.
    • At the individual level, common constraints include time and income.
    • Examples:
      • You may want a new cell phone but also need to pay for course access codes; you can usually do one or the other.
      • You may want to vacation with your parents but also need to work; trade-offs are necessary.
    • Time and income determine what choices are feasible for a person.
    • At the societal level, scarcity affects decisions about where to place manufacturing facilities, housing, etc. (e.g., preserving farmland vs. development).
    • Economics helps determine good decision-making rules for allocating scarce resources.

  • The two main branches of economics:

    • Microeconomics: focused on small, individual decisions and specific markets.
    • Macroeconomics: focused on the entire economy (aggregate outcomes).
    • The course in question is Microeconomics (micro):
    • Micro = small; studies individual decisions and specific markets.
    • Macro topics include US production of goods and services, US inflation, US unemployment, and other economy-wide statistics.
    • Practical note: In this course, some students may take macro first or micro first; Millersville typically doesn't require a specific order, though the instructor suggests micro first for a solid foundation.

  • Examples to illustrate micro vs macro:

    • Micro example: How will the entrance of Peacock affect Netflix subscribers? – Focuses on a single market (streaming services) within the US.
    • Macro example: GDP and overall production in the US economy – A macroeconomic topic (aggregate measure of goods and services produced within the country).
    • GDP definition (macro): a measure of the total value of all final goods and services produced domestically in a country over a given period.

  • Core economic concepts introduced:

    • Cost-Benefit Principle: Decide by weighing benefits and costs; proceed with the decision if benefits outweigh costs.
    • You may have done a pros-and-cons list to compare options (e.g., which college to attend).
    • Opportunity Cost Principle: The value of the next best alternative foregone; a central idea in economic thinking.
    • Example: By choosing Millersville, you forgo other possible universities; the opportunity cost is the value of the best alternative you did not choose.
    • On the Margin (Marginal Principle): Evaluate small adjustments to decisions.
    • Decision rule: Consider doing a little more or a little less to see if you are better off.
    • Formal intuition: Compare marginal benefits and marginal costs.
    • Example framing: Should you study an additional hour (marginal study time)? What is the marginal benefit vs. marginal cost?
    • Interdependence Principle: Decisions affect other decisions; choices are interconnected.
    • Examples:
      • Taking classes may reduce available work hours, and commuting choices may affect whether you need a car.
      • A decision to live on campus vs. commute can influence housing, transportation, and time used for work or study.
    • This highlights that decisions are not isolated; they interact with each other.

  • Making apples-to-apples comparisons in cost-benefit analysis:

    • Benefits are often not directly dollar-valued; to compare with costs (usually in dollars), convert benefits into monetary terms.
    • Analogy: Ask, "How much am I willing to pay for this benefit?" to translate benefits into a common unit.
    • Example: Tennis lessons
    • Cost: 80extperhour80 ext{ per hour}
    • Benefit: Improvement in playing ability valued at 9090 (to you) per hour of lesson.
    • Since 90 > 80, the lesson provides net benefit and is worth taking.

  • Notable practical notes from the lecturer:

    • The course will not focus on stock-market analysis; the aim is to develop decision-making tools applicable across contexts.
    • The field of economics includes a wide range of applications beyond markets and stocks (e.g., game theory, strategic interactions).
    • The tools learned in econ are transferable to many decision contexts, including personal finance, policy, and business strategy.
    • There is emphasis on the relevance of economic thinking to everyday choices and societal outcomes.

  • Summary of key terminology and definitions (for quick reference):

    • Scarcity: Unlimited wants but limited resources; necessitates choices.
    • Opportunity Cost: The value of the next best alternative forgone when making a decision.
    • Cost-Benefit Principle: A decision is rational if the total benefits exceed the total costs.
    • Marginal Principle (On the Margin): Decisions are often about small, incremental changes and comparing marginal benefits to marginal costs.
    • Interdependence: A decision can impact other decisions, creating a network of effects.
    • Microeconomics: Study of individual decisions and specific markets.
    • Macroeconomics: Study of economy-wide aggregates (GDP, inflation, unemployment).
    • GDP (Gross Domestic Product): The total value of all final goods and services produced domestically in a country over a given period.

  • Connections to broader learning and real-world relevance:

    • Economics equips students with analytic tools to decompose complex decisions into manageable parts.
    • The distinction between micro and macro helps organize thinking about decisions at different scales (individual markets vs. overall economy).
    • Real-world relevance includes education pathways, vocational skills, and policy considerations where scarce resources must be allocated efficiently.
    • The instructor emphasizes that econ is a broad social science about decision making, not just stock market trivia.

  • Quick glossary of key phrases to remember:

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  • Final takeaway:

    • Economics helps you become a better decision maker by teaching you to evaluate trade-offs, consider alternatives, think at the margin, and recognize the interconnectedness of choices in a world of limited resources.