需求與供應（一）
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21.
'Dynasty' is a wine produced jointly by the French and the Chinese in China. As the finest table wine produced in China, it is served only in the finest restaurants in China. This is because
22.
In grocery stores, wine of types A and B are priced at $60 and $90 respectively. The same wines sell for $90 and $120 in restaurants. If grocery stores sell equal quantities of each, then restaurants will
23.
Suppose the airport tax per passenger leaving Hong Kong is increased from $100 to $250. Which of the following is FALSE?