Luxury
goods that consumers like to buy if they can afford them
e.g. air travels and fashion items
Necessity
basic goods that consumers need to buy
e.g. food electricity and water
Price elastic
quantity demand is responsive to a change in price
PED
measures the responsiveness of quantity demanded to a change in price
always negative due to law of demand
Price inelastic
quantity demanded for the product is less responsive proportionately to a change in price