Economics for CSEC® Examinations - Basic Economic Concepts and Market Structures

BASIC ECONOMIC CONCEPTS

  • Definition of Economics:

    • Modern economists define economics as the study of how man allocates scarce resources, which have alternative uses, to achieve given ends or goals.
    • It is a social science because it deals with human behavior in society and uses the scientific method to formulate theories.
    • Key historical definitions include Adam Smith’s “inquiry into the nature and causes of the wealth of nations” and Alfred Marshall’s study of action connected to the “attainment of the material requisites of well-being.”

  • Scarcity and the Basic Economic Problem:

    • The basic economic problem is the imbalance between unlimited wants and limited resources.
    • Scarcity: The condition where resources are insufficient for all those who desire them.
    • Choice: The range of options available; wherever scarcity exists, choice is inevitable.
    • Opportunity Cost: Defined as "the next best alternative forgone." It is the cost of a choice measured by what is sacrificed.
    • Money Cost: The actual monetary payment for inputs (e.g., fabric and labor for a shirt).

  • Production Possibility Frontier (PPF):

    • A graph showing combinations of two goods an economy can produce with fixed resources.
    • Assumptions: Only two goods produced, fixed amount of resources, and variable factor proportions.
    • Concave Shape: The PPF is usually bowed out, indicating increasing opportunity costs as more of one good is produced.
    • Points on the PPF: Points on the curve are efficient and attainable; points inside are inefficient (idle resources); points outside are currently unattainable.
    • Shifts: Outward shifts are caused by economic growth, discovery of natural resources, population growth, technological progress, or improved labor productivity.

ECONOMIC DECISIONS

  • Influences on Households (Consumers):

    • Size of Income: Higher income allows for more/better quality purchases.
    • Bandwagon Effect: Purchasing items because others are (peer pressure/fads).
    • Interest Rates: High rates encourage saving; low rates encourage borrowing for durables.
    • Other Factors: Personal choice, type of work, education level, and climate/weather conditions.

  • Influences on Firms (Producers):

    • Costs of Production: Higher costs can reduce output.
    • Profits: Rational producers are attracted by supernormal profits (excess of revenue over costs).
    • Industrial Relations: Cordial relations with trade unions encourage labor employment; poor relations may lead to more capital use.
    • Resource Base: The quality and type of resources available.

  • Government Influences:

    • Laws & Regulations: Minimum wage laws, laws against discrimination, and zoning.
    • Taxes & Subsidies: Taxes (e.g., excise duties on alcohol/gasoline) curb consumption; grants/subsidies encourage local production.

FACTORS OF PRODUCTION

  • The Four Factors:

    • Land: All naturally occurring free gifts of nature (seas, minerals, climate). It is fixed in supply and geographically immobile.
    • Labour: Physical and mental effort of humans. Supply depends on population size and willingness to work.
    • Capital: Man-made goods used to produce more goods. Includes fixed capital (factories) and working capital (raw materials).
    • Entrepreneurship: The factor that organizes the other three and bears the financial risk.

  • Factor Rewards and Payments:

    • Land earns Rent.
    • Labour earns Wages.
    • Capital earns Interest.
    • Entrepreneurship earns Profit.
    • The sum of these payments equals the total cost of production.

  • Production vs. Productivity:

    • Production: The conversion of inputs into goods (tangible) and services (intangible).
    • Productivity: Measure of output per unit of input. Formulas:
      • Labour Productivity=Quantity of OutputQuantity of Labour Used\text{Labour Productivity} = \frac{\text{Quantity of Output}}{\text{Quantity of Labour Used}}
      • Productivity of Capital=Quantity of OutputQuantity of Capital Used\text{Productivity of Capital} = \frac{\text{Quantity of Output}}{\text{Quantity of Capital Used}}

ECONOMIC SYSTEMS

  • Resource Allocation Questions: What to produce? How to produce? For whom to produce?
  • Traditional Economy: Based on custom/habit, subsistence farming, and barter. Common in isolated tribes.
  • Command (Planned) Economy: The state owns resources. Planning authorities make allocation decisions. No private sector.
  • Free Market Economy: Resources allocated via the price mechanism (demand and supply). Driven by the profit motive.
  • Mixed Economy: Elements of both command and market. Private and public sectors coexist. Most Caribbean nations are mixed economies.

MARKET FORCES

  • Demand:

    • Individual Demand: Demand by one consumer.
    • Market Demand: The sum of all individual demands at each price.
    • Law of Demand: Inverse relationship between price and quantity demanded.
    • Shifts vs. Movements: A change in price causes a movement along the curve (contraction/extension). Change in determinants (income, tastes, advertising) causes a shift.

  • Supply:

    • Law of Supply: Direct relationship between price and quantity supplied.
    • Determinants: Price of the good, costs of factor inputs, technology, and taxes/subsidies.

  • Equilibrium:

    • Occurs where Demand = Supply.
    • Market Clearing Price: The price where there is no surplus or shortage.
    • Surplus: Quantity Supplied > Quantity Demanded (occurs at prices above equilibrium).
    • Shortage: Quantity Demanded > Quantity Supplied (occurs at prices below equilibrium).

ELASTICITY

  • Price Elasticity of Demand (PED):

    • PED=% change in Quantity Demanded% change in Price\text{PED} = \frac{\% \text{ change in Quantity Demanded}}{\% \text{ change in Price}}
    • The PED coefficient is always negative due to the inverse relationship.
    • Degrees: Perfectly inelastic (0), Inelastic (

  • Income Elasticity (YED):

    • Normal goods have positive YED; Demand increases as income increases.

  • Cross Elasticity (XED):

    • Positive for Substitutes (Price of A rises, Demand for B rises).
    • Negative for Complements (Price of A rises, Demand for B falls).

  • Price Elasticity of Supply (PES):

    • PES=% change in Quantity Supplied% change in Price\text{PES} = \frac{\% \text{ change in Quantity Supplied}}{\% \text{ change in Price}}

MARKET STRUCTURE

  • Spectrum of Competition:
    • Perfect Competition: Many buyers/sellers, homogeneous product, perfect knowledge, price-takers.
    • Monopoly: One seller, unique product, high barriers to entry, price-maker.
    • Monopolistic Competition: Many sellers, differentiated products (branding), low barriers to entry.
    • Oligopoly: Few large sellers, interdependent behavior, price rigidity, possible collusion (cartels).

MARKET FAILURE

  • Causes:

    • Public Goods: Non-excludable and non-diminishable. Leads to the "free-rider" problem.
    • Merit Goods: Goods like health and education that are under-consumed if left to the market.
    • Externalities: Spillovers on third parties (e.g., pollution is a negative production externality).
    • Monopoly Power: Resulting in higher prices and lower output than the socially optimum level (\text{P} > \text{MC}).

  • Consequences: Unemployment, poverty, economic depression, and reduced societal welfare.

THE FINANCIAL SECTOR

  • Money: Anything acceptable for settling debts. Functions: Medium of exchange, Store of value, Unit of account, Standard of deferred payment.
  • Central Bank: Oversees the financial sector, issues currency, implements monetary policy, and acts as banker to the government/commercial banks.
  • Repo Rate: The rate at which the central bank provided overnight liquidity to commercial banks; influences overall interest rates.
  • Common Financial Institutions: Commercial banks, Credit unions (member-owned), Insurance companies, Stock exchanges (facilitating share trading), and Development banks.
  • Informal Sector: Economic activities not under official control (e.g., "moonlighting," sou-sous/partners).

NATIONAL INCOME AND MACROECONOMICS

  • GDP vs. GNP:
    • GDP: Output produced within a country's borders regardless of ownership.
    • GNP: Output produced by factors owned by nationals, regardless of location.
    • GDP+Net property income from abroad=GNP\text{GDP} + \text{Net property income from abroad} = \text{GNP}.
  • The Circular Flow of Income: Shows the movement of factor incomes from firms to households and expenditure from households to firms.
    • Injections: Investment (I), Government Spending (G), Exports (X).
    • Leakages: Savings (S), Taxes (T), Imports (M).
  • Inflation: Persistent rise in the general price level. Causes: Demand-pull, Cost-push (wage-price spiral), and Imported inflation.
  • Unemployment Types:
    • Structural: Changes in industrial structure or technology.
    • Cyclical: Due to a fall in aggregate demand (recession).
    • Frictional: People in between jobs or geographic/occupational immobility.
    • Seasonal: Due to seasonal nature of demand (e.g., tourism, agriculture).

GROWTH AND DEVELOPMENT

  • Economic Growth: Increase in real per capita GDP. It is a driver for development but does not guarantee it.
  • Economic Development: Sustainable increase in the quality of life, including life expectancy, literacy, and environmental protection.
  • Human Development Index (HDI): Measures average achievement in health (life expectancy), knowledge (literacy), and standard of living (adjusted real income).

INTERNATIONAL TRADE AND GLOBALIZATION

  • Absolute vs. Comparative Advantage:
    • Absolute: Producing more of a good using the same resources.
    • Comparative: Producing a good at a lower opportunity cost.
  • Trade Liberalization: The reduction of trade barriers (tariffs, quotas, embargoes).
  • Globalization: The emergence of a single world market. Driven by technology, improved transport, and capital market liberalization.
  • CARICOM Single Market and Economy (CSME): Regional effort for free movement of goods, services, capital, and labor among Caribbean states.
  • E-commerce: Conducting business online (B2B and B2C). Offers wider variety and lower costs but faces challenges like credit card fraud.