Economics studies the allocation of limited resources to satisfy unlimited wants, focusing on the production, distribution, and consumption of goods and services. Key economic terms include wants, needs, scarcity, choice, and resources, while the main economic problems involve what to produce, how to produce, and for whom to produce. Furthermore, different types of resources and basic economic activities such as production, consumption, and exchange are outlined. The concept of opportunity cost is introduced as the value of the next best alternative forgone in decision-making.