What is price demand income demand and cross demand?

Price demand refers to the relationship between the price of a good and the quantity demanded by consumers; typically, as prices decrease, demand increases, and vice versa. Income demand indicates how the quantity demanded of a good changes as consumer income changes, with normal goods seeing increased demand as income rises, while inferior goods may see decreased demand. Cross demand measures how the quantity demanded of one good responds to changes in the price of another good, where substitutes see an increase in demand when the price of the alternative rises, and complements see a decrease in demand when the price of the related good rises.