Comprehensive Introduction to Economic Theory and Policy
Fundamental Economic Concepts and the Law of Scarcity
The central problem that serves as the foundation for economic study is scarcity (escasez). This condition is defined by the perpetual imbalance where human needs and desires exceed the available resources, symbolically represented by the relationship Need > Resource. A key psychological observation noted in the study of economic behavior is that the intensity of human desire tends to decrease as the corresponding need is gradually satisfied.
Defining Economics as a Social Science
Economics is formally defined as a social science characterized by the observation and description of how society manages the distribution of scarce resources among various alternative ends. To understand the operational framework of this science, one must recognize three interconnected pillars: scarcity, choice, and opportunity cost. The reality of scarcity necessitates choice, and every choice inherently involves an opportunity cost, which is the sacrifice of the second-best option available.
The Aims of Economic Study
Economics pursues two specific types of goals: theoretical and practical. The theoretical aim involves the use of theories, laws, and models to represent and explain the complexities of economic reality. The practical aim is centered on the achievement of social welfare (bienestar). This achievement is quantitatively and qualitatively measured through indicators such as levels of production, total employment rates, and consumption patterns.
Positive Economics: The Realm of Facts
Positive economics is the branch of the discipline that deals with "what is." It focuses on real facts and objective analysis. Statements in positive economics are fundamentally assertions that can be tested, demonstrated, and proven to be either true or false. This branch is rooted in established cause-and-effect relationships. An example of a positive economic assertion is: "The legal minimum wage generates unemployment."
Positive economics is subdivided into two functional areas: Descriptive Economics and Economic Theory. Descriptive economics involves the systematic observation and documentation of economic phenomena to gather data. Economic theory then takes this descriptive data to analyze and explain how the economy functions.
Divisions of Economic Theory: Microeconomics and Macroeconomics
Economic theory is divided into two primary fields of study: microeconomics and macroeconomics. Microeconomics focuses on the individual agents and units within the economy. Its primary subjects of study include the decision-making processes of families and businesses, the dynamics of specific markets, and the mechanisms of price determination.
Macroeconomics, by contrast, focuses on the summation of economic activity, looking at the aggregate whole. A fundamental equation used in macroeconomics to calculate the Gross Domestic Product (PBI) is:
Macroeconomics studies large-scale economic factors and their interactions, including inflation, total employment, taxation structures (tributos), the money supply (masa monetaria), and general price levels.
Normative Economics and Economic Policy
Unlike positive economics, normative economics deals with "what should be." This branch is subjective and involves value judgments, ethics, and idealistic prescriptions for the economy. An example of a normative statement is: "The legal minimum wage should be eliminated."
This normative perspective informs Economic Policy, which consists of the specific measures and actions implemented by authorities to achieve defined socio-economic objectives. The primary goals of economic policy typically include the attainment of full employment, the promotion of steady economic growth, and the maintenance of price stability.n