Durability of the Commodity:
With some commodities, we require one at a time and they are used for a very long time before they get spoilt. Examples of such goods are cars, televisions, furnitures, building, clothes etc. They tend to hve low elasticity of demand (inelastic demand) because when the price of a durable commodity changes, consumers will continue to use what the have.Even when the price of such a commodity falls, it is new consumers who will mostly buy them.
Luxuries and Necessities
Luxuries are things we can always do away with hence they tend to have elastic demand. Necessities are difficult to dispense with and they tend to have inelastic demand.