| 3. | People cannot have all the goods and services they want and, as a result, must choose some things and give up others. |
| 4. | Different economic systems (traditional, market, command, and mixed) utilize different methods to allocate limited resources. |
| 5. | Markets exist when consumers and producers interact. When supply or demand changes, market prices adjust. Those adjustments send signals and provide incentives to consumers and producers to change their own decisions. |
| 6. | Competition among sellers lowers costs and prices, and encourages producers to produce more of what consumers are willing and able to buy. Competition among buyers increases prices and allocates goods and services to those people who are willing and able to pay the most for them. |