1. D - Economic theories represent irrefutable facts.
2. C - simplify economic theories, so as to make it possible to answer economic questions.
3. D - all of the other options are true.
4. C - the model describes two circular flows: one for inputs and one for resources.
5. B - dollars in the economy are used over and over in an endless cycle.
6. A - Any point along the PPF represents an efficient level of production.
7.B - shift of the PPF away from the origin.
8. C - how households and firms make decisions and how they interact in markets.
9. B - The government should increase spending during recessions, so that the economy recovers quickly.
10. D - all the other options are true.
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