You choose to study instead of playing games with your friends. The opportunity cost is the enjoyment and socializing you could have had by playing games with your friends. Business activity involves producing goods and services to meet people's needs and wants. However, people's wants are unlimited while resources for production are limited. This creates an economic problem because there are not enough resources to satisfy all wants. Limited resources mean businesses must make choices about which goods and services to provide, and individuals must consider opportunity costs when making decisions about how to use their resources.