单项选择题

What does the sentence "the desire of individuals to maximize their incomes" mean in Para. 1

A．Americans are never satisfied with their incomes.
B．Americans tend to overstate their incomes.
C．Americans want to have their incomes increased.
D．Americans want to increase the purchasing power of their incomes.

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单项选择题

What can we infer from the first two sentences in the second paragraph

A．Producers can satisfy the consumers by mechanized production.
B．Consumers can express their demands through producers.
C．Producers decide the prices of products.
D．Supply and demand regulate prices.

单项选择题

According to the passage, which statement is tree

A．If the product is in short supply compared with demand, the producers are unlikely to increase its production.
B．Producing more of a commodity results in elimination of parts of goods.
C．Consumers' demands actually control the 'price of the commodity.
D．Price may reflect the relationship between supply and demand directly.