This document discusses different types of demand, including: - Consumer vs producer demand, with consumer demand for necessities like rice and clothes, and producer demand for raw materials. - Autonomous vs derived demand, with autonomous demand based on human wants and derived demand dependent on another product's demand. - Durable vs perishable demand, with durable goods like appliances lasting long periods and perishable goods like vegetables lasting less than a day. - Short run vs long run demand, estimating demand over 6 months to 1 year for short run and over 1 year for long run. - New vs replacement demand, with new demand for novel products and replacement demand to maintain existing products. Factors influencing demand are also outlined