Demand analysis is important for managers to make production decisions. Demand refers to the quantity of a product consumers will purchase at a given price. There are several types of demand including durable/perishable goods demand, consumer/producer goods demand, autonomous/derived demand, and individual/market demand. Market demand is the sum of individual demands. Factors that influence demand include price, income, tastes, prices of related goods, population size, expectations, government policy, credit availability, advertising, and season/weather. Understanding these demand factors is essential for effective production planning.