Economics is the study of how individuals and societies make choices to satisfy unlimited wants with limited resources. It can be divided into microeconomics, which examines individual and firm decision-making, and macroeconomics, which analyzes entire economies and sectors. There are four factors of production - natural resources, human resources, capital resources, and entrepreneurship - that are used to create goods and services for consumers and producers. Economic decision-makers include consumers who purchase goods and services based on needs and wants, and producers who supply goods and services to satisfy consumers.