1.2 - How markets work Flashcards
What is diminishing marginal utility?
The marginal utility of extra units decline as more is consumed
Marginal utility - the change in satisfaction from consuming an extra unit
Assumptions of rational economic decision making
- Consumers are utility maximisers
- Firms are profit maximisers
What is demand?
The quantity of a good or service that you are willing and able to buy at a given price in a given time period
What is derived demand?
The demand for a factor of production used to produce another good or service (e.g. steel)
What is the Law of Demand?
Inverse relationship between the price of a good and demand
As price fall, we see an extension of demand
As price increase, we see a contraction of demand
Why is more demanded when price falls (2)
- Income effect
- Substitute effect
What causes shifts in demand (PASIFIC)
Population
Advertisment
Substitutes
Income
Fashion
Income tax
Complements
What is the price elasticity of demand (PED)
Measures the responsiveness of quantity demanded after a change in price
% change in QD / % change in P
PED = 0
Price is perfectly inelastic
PED = between 0 and 1
Price inelastic
PED = -1
Unitary elastic
PED = between -1 and infinite
Elastic
PED = infinite
Pefectly elastic
Factors affecting PED (SPLAT)
Substitutes
Proportion of income
Luxury vs necessity goods
Addictiveness
Time
What is the income elasticity of demand (YED)
The responsiveness in the quantity demanded to a change in income
YED = % change in Qd / % change in Y
Inferior goods - negative YED
Necessity goods - between 0 and 1 YED
Luxury goods - above 1 YED
What is cross elasticity of demand (XED)
The responsiveness in the quantity demanded of good A to a change in price of good B
XED = % change in Qd (Good A) / % change in P (Good B)