1. The Choices Producers Make
The economy is made up of two groups: producers and consumers.
Producers use the factors of production—land, capital, labor, and entrepreneurs—to create their products.
Land includes not just the earth, but also mineral and oil deposits, livestock, and climate conditions.
Capital includes the tools, equipment, machinery, and factories used to produce goods and services.
Labor includes the efforts, abilities, and skills of all people except entrepreneurs.
Entrepreneurs are risk-takers who start new businesses or bring new products to market.

2. Production Possibilities
Economists use a production possibilities curve to illustrate all possible combinations of economic output.
All points on the production possibilities curve represent maximum combinations of output when all resources are fully employed.
All economic or production decisions have an opportunity cost—the value of the next best alternative that was not taken.
When resources are not fully employed, a society cannot reach its maximum potential, resulting in an opportunity cost.

3. The Choices Consumers Make
Every decision we make has trade-offs, or alternative choices.
Opportunity costs apply to consumers as well as producers.
Consumerism was a social movement that resulted in a list of five consumer rights.
Consumers also have responsibilities, such as behaving ethically with producers and researching products fully before making a purchase..