Edexcel IGCSE Economics – Full
Analytical Notes (Topics 1 to 24)
Edexcel IGCSE Economics – Analytical
Notes (Topics 1 to 5)
1. The Economic Problem
Scarcity is the basic economic problem: resources are limited but human wants are infinite.
Because of this, choices must be made, leading to opportunity cost—the next best
alternative foregone.
The Production Possibility Frontier (PPF) shows the maximum possible output
combinations of two goods that an economy can produce using all resources efficiently.
Points inside the PPF are inefficient, on the PPF are efficient, and outside are currently
unattainable. An outward shift in the PPF indicates economic growth (more resources or
better technology); an inward shift indicates decline.
Opportunity cost applies to all economic agents (households, firms, and governments). For
example, a government choosing to spend more on healthcare may have to spend less on
education.
Example: During COVID-19, many governments reallocated funding from public projects to
healthcare, demonstrating real-world opportunity cost decisions under scarcity.
2. Economic Assumptions
Economic models are based on assumptions to simplify complex human behavior:
1. Ceteris Paribus – Holding all other variables constant to isolate the effect of one.
2. Rational Behavior – Assumes consumers aim to maximize satisfaction, and producers aim
to maximize profit.
3. Perfect Information – Assumes everyone has full knowledge of prices, quality, etc.
4. Positive vs Normative Statements:
- Positive: Objective and testable (e.g. "Higher interest rates reduce borrowing").
- Normative: Subjective and value-based (e.g. "The government should reduce inequality").
Criticism: Behavioral economics shows real people are influenced by emotion, habits, and
cognitive bias, meaning they often behave irrationally and with imperfect information. This
limits the reliability of economic models in real-world application.
, 3. The Demand Curve
The demand curve shows the inverse relationship between price and quantity demanded
(ceteris paribus). As price falls, demand increases due to:
- The income effect: Lower prices increase purchasing power.
- The substitution effect: Consumers switch from relatively more expensive alternatives.
Movement along the demand curve occurs due to price changes.
Shifts in the demand curve occur due to changes in non-price determinants (e.g. income,
preferences, price of substitutes/complements, population, and expectations).
Example: If smartphone prices fall, consumers may buy more, increasing quantity
demanded (movement along curve). If consumers prefer more sustainable phones, the
demand curve shifts right.
4. Factors That May Shift the Demand Curve
Shifts in demand occur due to non-price factors:
- Income: Normal goods (demand rises with income); Inferior goods (demand falls as
income rises).
- Preferences and tastes: Trends or fads increase demand.
- Prices of related goods:
- Substitutes: A rise in the price of coffee increases demand for tea.
- Complements: A fall in the price of printers increases demand for ink.
- Population size and demographics.
- Future expectations: If prices are expected to rise, demand may increase now.
Rightward shift: More is demanded at every price.
Leftward shift: Less is demanded at every price.
Example: Increased environmental awareness can increase demand for electric vehicles,
shifting the curve right.
5. The Supply Curve
The supply curve shows a direct relationship between price and quantity supplied, ceteris
paribus. As price rises, supply increases because producers are incentivized by higher
potential revenue.
Movement along the supply curve results from a change in the good’s price.
Shifts in supply occur due to non-price factors:
- Cost of production: Higher costs reduce supply (shift left); lower costs increase supply
(shift right).
- Technology: Increases efficiency and shifts supply right.
- Taxes and subsidies: Taxes raise production costs (shift left); subsidies lower costs (shift
right).
Analytical Notes (Topics 1 to 24)
Edexcel IGCSE Economics – Analytical
Notes (Topics 1 to 5)
1. The Economic Problem
Scarcity is the basic economic problem: resources are limited but human wants are infinite.
Because of this, choices must be made, leading to opportunity cost—the next best
alternative foregone.
The Production Possibility Frontier (PPF) shows the maximum possible output
combinations of two goods that an economy can produce using all resources efficiently.
Points inside the PPF are inefficient, on the PPF are efficient, and outside are currently
unattainable. An outward shift in the PPF indicates economic growth (more resources or
better technology); an inward shift indicates decline.
Opportunity cost applies to all economic agents (households, firms, and governments). For
example, a government choosing to spend more on healthcare may have to spend less on
education.
Example: During COVID-19, many governments reallocated funding from public projects to
healthcare, demonstrating real-world opportunity cost decisions under scarcity.
2. Economic Assumptions
Economic models are based on assumptions to simplify complex human behavior:
1. Ceteris Paribus – Holding all other variables constant to isolate the effect of one.
2. Rational Behavior – Assumes consumers aim to maximize satisfaction, and producers aim
to maximize profit.
3. Perfect Information – Assumes everyone has full knowledge of prices, quality, etc.
4. Positive vs Normative Statements:
- Positive: Objective and testable (e.g. "Higher interest rates reduce borrowing").
- Normative: Subjective and value-based (e.g. "The government should reduce inequality").
Criticism: Behavioral economics shows real people are influenced by emotion, habits, and
cognitive bias, meaning they often behave irrationally and with imperfect information. This
limits the reliability of economic models in real-world application.
, 3. The Demand Curve
The demand curve shows the inverse relationship between price and quantity demanded
(ceteris paribus). As price falls, demand increases due to:
- The income effect: Lower prices increase purchasing power.
- The substitution effect: Consumers switch from relatively more expensive alternatives.
Movement along the demand curve occurs due to price changes.
Shifts in the demand curve occur due to changes in non-price determinants (e.g. income,
preferences, price of substitutes/complements, population, and expectations).
Example: If smartphone prices fall, consumers may buy more, increasing quantity
demanded (movement along curve). If consumers prefer more sustainable phones, the
demand curve shifts right.
4. Factors That May Shift the Demand Curve
Shifts in demand occur due to non-price factors:
- Income: Normal goods (demand rises with income); Inferior goods (demand falls as
income rises).
- Preferences and tastes: Trends or fads increase demand.
- Prices of related goods:
- Substitutes: A rise in the price of coffee increases demand for tea.
- Complements: A fall in the price of printers increases demand for ink.
- Population size and demographics.
- Future expectations: If prices are expected to rise, demand may increase now.
Rightward shift: More is demanded at every price.
Leftward shift: Less is demanded at every price.
Example: Increased environmental awareness can increase demand for electric vehicles,
shifting the curve right.
5. The Supply Curve
The supply curve shows a direct relationship between price and quantity supplied, ceteris
paribus. As price rises, supply increases because producers are incentivized by higher
potential revenue.
Movement along the supply curve results from a change in the good’s price.
Shifts in supply occur due to non-price factors:
- Cost of production: Higher costs reduce supply (shift left); lower costs increase supply
(shift right).
- Technology: Increases efficiency and shifts supply right.
- Taxes and subsidies: Taxes raise production costs (shift left); subsidies lower costs (shift
right).
