Complementary products
Shift curve to the left
Move along demand curve
Only way is to change the price of the good
Elastic demand
More substitutes for a good
Inelastic
Proportion of consumer income spent on good is small
CPED
Negative for complementary goods
PED
Likely to change with the length of time since price change
Books
Inferior good
Income elasticity is negative
Theory of supply
Quantity of good suppliers are able to sell with the aim of maximising profits
Market mechanism
Lower selling price than equilibrium = low stock levels
Factors of production
Land
Labour
Capital
Enterprise
Marginal revenue
Increase in total revenue from selling one more unit