This document, "ECO101: Introduction to Economics," provides a comprehensive overview of fundamental economic principles, covering both microeconomic and macroeconomic concepts essential for an introductory course. It begins by establishing the core problem of scarcity and the necessity of choice, introducing key concepts like opportunity cost and the distinction between microeconomics and macroeconomics. The document then explores various economic systems, from traditional to market-based, and delves into foundational microeconomic theories such as the Production Possibility Frontier, demand and supply analysis, market equilibrium, and elasticity.

Further microeconomic topics include consumer behavior (utility theory), producer behavior (production functions and costs), and an in-depth look at different market structures, including perfect competition, monopoly, monopolistic competition, and oligopoly. The latter half of the document transitions into macroeconomic principles, explaining national income accounting (GDP, GNP), inflation, and unemployment. It also covers the essential tools of macroeconomic policy, namely fiscal and monetary policies, and concludes with an introduction to international economics, discussing trade theories (absolute and comparative advantage), exchange rates, and trade barriers.

Overall, the document provides a robust foundation for understanding how individuals, businesses, and governments make decisions in the face of limited resources, how markets function, and how national economies operate and interact globally. It is designed to equip students with the essential vocabulary, analytical tools, and conceptual frameworks required for further study in economics, emphasizing the interconnectedness of economic decisions and their broader societal implications.

Economics is defined as a social science that studies how societies allocate scarce resources to satisfy unlimited wants and needs. The core problem in economics is scarcity, which arises because human desires for goods, services, and resources exceed what is available. This fundamental scarcity necessitates choice, as individuals and societies must decide how to use their limited resources.

* Opportunity Cost: The value of the next best alternative that must be foregone when a choice is made. It is the true cost of any decision.

* Microeconomics: The branch of economics that focuses on the behavior of individual economic units, such as households, firms, and individual markets. It analyzes how these units make decisions and interact.

* Macroeconomics: The branch of economics that deals with the economy as a whole, focusing on aggregate phenomena like national income, inflation, unemployment, and economic growth.

Economic systems are the institutional frameworks societies use to organize the production, distribution, and consumption of goods and services.

* Traditional Economy: Decisions are based on customs, traditions, and historical practices. Often found in rural, agrarian societies.

* Command Economy (Planned Economy): A central authority (government) makes all major economic decisions regarding production, distribution, and resource allocation.

* Market Economy: Economic decisions are primarily made by individuals and private firms interacting in markets, guided by prices and the pursuit of self-interest. Private ownership of resources is key.

* Mixed Economy: A combination of market and command elements, where both private enterprise and government intervention play significant roles in economic decision-making. Most modern economies are mixed.

The Production Possibility Frontier (PPF) is a graphical model that illustrates the maximum possible combinations of two goods or services that an economy can produce efficiently, given its available resources and technology.

* Assumptions:

* Fixed amount of resources (land, labor, capital, entrepreneurship).

* Full and efficient utilization of all resources.

* Fixed level of technology.

* Only two goods are produced.

* Concepts Illustrated:

* Scarcity: The PPF shows the limits of what can be produced.

* Choice: Moving along the PPF involves choosing more of one good at the expense of another.

* Opportunity Cost: The slope of the PPF represents the opportunity cost of producing one more unit of a good.

* Efficiency: Points on the PPF are efficient; points inside are inefficient; points outside are unattainable.

* Shape of the PPF: Typically concave (bowed outward) due to the Law of Increasing Opportunity Cost.

* Law of Increasing Opportunity Cost: As an economy produces more of one good, the opportunity cost of producing an additional unit of that good increases. This is because resources are not perfectly adaptable to the production of all goods.

* Shifts in the PPF:

* Outward Shift: Represents economic growth, caused by an increase in resources (e.g., population growth, discovery of new natural resources) or technological advancements.

* Inward Shift: Represents a decrease in productive capacity, perhaps due to natural disaster or war.

* Law of Demand: States that, ceteris paribus (all other things being equal), there is an inverse relationship between the price of a good and the quantity demanded. As price increases, quantity demanded decreases, and vice versa.

* Demand Schedule: A table showing the quantities of a good demanded at different prices.

* Demand Curve: A graphical representation of the demand schedule, typically downward-sloping.

* Determinants of Demand (Shifters of the Demand Curve): Factors other than price that can cause the entire demand curve to shift.

* Income: For normal goods, demand increases with income; for inferior goods, demand decreases with income.

* Tastes and Preferences: Changes in consumer preferences can increase or decrease demand.

* Expectations: Future price or income expectations can influence current demand.

* Prices of Related Goods:

* Substitutes: Goods that can be used in place of another. An increase in the price of a substitute increases demand for the original good.

* Complements: Goods that are consumed together. An increase in the price of a complement decreases demand for the original good.

* Number of Buyers: An increase in the number of consumers in the market increases overall demand.

* Change in Quantity Demanded vs. Change in Demand:

* Change in Quantity Demanded: A movement along the demand curve, caused solely by a change in the good's own price.

* Change in Demand: A shift of the entire demand curve (either left or right), caused by a change in one of the non-price determinants.