This document discusses topics related to individual and market demand. It begins by outlining topics that will be covered, including individual demand, income and substitution effects, market demand, and consumer surplus. It then provides details on individual demand curves and how they are impacted by price and income changes. The key concepts of substitution and income effects of price changes on demand are explained. The document also discusses how market demand curves are derived by summing individual demand curves and how they are impacted by elasticity. It provides an example of calculating point and arc elasticity. Finally, it discusses the concept of consumer surplus.