DEMAND The needs of consumers are what drive demand, and demand's nature is heavily influenced by how much consumers value the product or service. We all require necessities, like basic foodstuffs, but some may be highly sought after and others may consider them worthless. A number of factors influence the level of demand for a good or service, including: the price of another good or service, especially if it is a substitute or complement, the price of other goods and services, and income preferences and expectations. Traditional economic analysis examines these determinants by comparing the quantity demanded to one of these variables while assuming that all other variables remain constant (or ceteris paribus). The relationship between price and quantity demanded is the most common way to analyze demand. The quantity demanded is inversely correlated with price, as long as other determinants of demand remain constant and people act rationally.As a result, when prices rise, so do...