Private good is a product or service produced by a privately owned business and purchased to increase the utility, or satisfaction, of the buyer. The majority of the goods and services consumed in a market economy are private goods, and their prices are determined to some degree by the market forces of supply and demand. Pure private goods are both excludable and rivalrous, where excludability means that producers can prevent some people from consuming the good or service based on their ability or willingness to pay and rivalrous indicates that one person’s consumption of a product reduces the amount available for consumption by another. In practice, private goods exist along a continuum of excludability and rivalry and can even exhibit only one of these characteristics.