an increase in demand

a decrease in demand

when one good is demanded alongside another good

having the willingness and ability to buy a good or service

caused by a change in the determinants of demand.

the price at which planned demand for a good or service exactly equals planned supply.

caused by a change in price with all other things being equal

goods that are demanded because of a demand for another good e.g cinema and popcorn

when one good is demanded for two or more uses.

goods that can be replaced with another good and carry out the same service.