需求與供應（二）：彈性
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A free good
A free good is a good that yields zero
Due to exceptionally good weather, the supply of wheat has increased. The total benefit of wheat will _________ and the total market value _________.
Mary spent $500 to enter a lucky draw and won an airline ticket with a market price of $3 000. The ticket was neither transferable nor refundable. Which of the following is correct?
A free good
Currently, with no entrance fee, the flow of visitors to the Hong Kong Park does not reach its full capacity. If the government now charges an entrance fee,
If floods in China destroyed half the output of rice, the total benefit of rice will
Which of the following statements about 'benefit' is true?
'Consumer equilibrium' means
Consumer surplus is