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29. In the markets for goods and services in the circular-flow diagram,
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8 a.households and firms are both buyers.b.households and firms are both sellers.c.households are buyers and firms are sellers.d.households are sellers and firms are buyers.30.Which of the following transactions does nottake place in the markets for the factors of production in thecircular-flow diagram?31.Any point on a country's production possibilities frontier(邊境)represents a combination of two goods that an economy32. Where can an economy notproduce?outside its production possibilities frontierd.at the endpoints of its production possibilities frontier33. Unemployment would cause an economy toa.produce inside its production possibilities frontier.b.produce on its production possibilities frontier.c.produce outside its production possibilities frontier.d.experience an inward shift of its production possibilities frontier.34. The production possibilities frontier illustrates