Final answer:
Economics is the study of how people make decisions in situations with interdependent goals and interactions with others.
Step-by-step explanation:
Economics is the study of how humans make decisions in situations where attaining their goals depends on their interactions with others. This includes the study of decisions made by firms and industries where profits depend on interactions with other firms. Economics is a social science that examines how people choose among the alternatives available to them, using a scientific approach to investigate choices.