Economics Chapter 4, Sections 1-2: The Laws of Supply and Demand Terms to Know: Section 1: Value of Goods Demand is the amount of a good that is bought at a certain price under certain conditions, or the relationship between a good's price and the amount of that people are willing to buy. Supply is the quantity of a good for sale at a certain price under certain conditions or the relationship between a good's price and the amount that producers are willing to provide for consumers. The value in use is the value that is directly related to the benefits their owners receive through their use. The value in exchange us what a particular good is worth in exchange for some other good. The price is the amount of money that a buyer pays the seller for a particular item. Section 2: Marginal Utility and Value The diminishing marginal utility is the phenomenon where one's supply of a specific good or service increases, the satisfaction derived from each addition