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37 of 50 The downward slope of the demand curve indicates O the price must rise to induce rms to increase the quantity supplied. 0 a reduction in the price of a good causes individuals to increase their purchase of that good. 0 an increase in the price will cause a leftward shift in the demand curve. 0 all of the above. 38 of 50 Ellie chooses to go to college full time rather than to work. Ellie: O is not part of the labor force. 0 is part of the labor force and what economists call a discouraged worker. O is part of the labor force, but not actively seeking work. 0 is considered employed. 39 0f 50 Central planning is a key characteristic of which economic system? 0 Free market system 0 Command and control system 0 Price system 0 Mixed economic system 40 0f 50 The production possibilities curve shows all possible combinations of 0 two goods that can be efciently produced with a given set of resources. 0 two goods that are desired by society. 0 two goods that can be purchased given the prices of the goods. 0 two goods that two countries can trade with each other