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<p>Because bagels and cream cheese are often eaten together, they are complements.</p><p>a.     We observe that both the equilibrium price of cream cheese and the equilibrium quantity of bagels have risen. What could be responsible for this pattern – a fall in the price of flour or a fall in the price of milk? Illustrate and explain your answer.</p><p>b.     Suppose instead that the equilibrium price of cream cheese has risen but the equilibrium quantity of bagels has fallen. What could be responsible for this pattern – a rise in the price of flour or a rise in the price of milk? Illustrate and explain your answer.</p><p> </p><p> </p><p>Residential housing in Shenzhen and Hong Kong are substitutes. Suppose the Hong Kong SAR Government had provided more land for auction and then the total land available for residential housing increases. (On average, assume that a building will be completed after three years from the date of auction.)  On the other hand, suppose three years later the Hong Kong SAR Government suddenly agreed with the Shenzhen Government to open the customs in Lo Wu 24 hours a day. The Hong Kong people found living in Shenzhen more convenient than before. What would be the effects on the equilibrium price and equilibrium quantity of the residential housing market in Hong Kong after three years? </p><p> </p><p>晕死，不知道怎么回答。。。。。。请各位高手伸出援手。。。</p>

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关键词：equilibrium Residential Responsible complements GOVERNMENT quantity together Because instead cheese

A：因为百吉饼和奶油干酪是互补品，因此百吉饼消费量（均衡数量）上升可带动奶油干酪消费量上升，从而导致后者的均衡价格上升；面粉是制作百吉饼的主要原料，如果面粉价格下降，则会带来百吉饼价格下降，消费量上升（牛奶价格的下降也可做类似解释）。因此，在回答时将面粉价格下降作为出发点即可；

B：牛奶价格上升导致奶油干酪价格上升，消费百吉饼的总成本上升（因为要搭配奶油干酪），从而导致百吉饼的均衡消费量下降；如果是面粉价格和奶油干酪价格一起上升，就更能解释百吉饼消费量的下降了。

——这道题的关键是互补品的价格弹性，然后选择好解释的出发点即可。

第三题应该是有不同的情况：香港住宅用地供给增加会导致住房均衡价格下降，数量上升；口岸开放导致深圳住宅对香港住宅的替代性增强，考虑到深圳住宅的价格优势，会导致对香港住宅的需求减少，均衡价格和数量都会下降。因此，三年后，香港住宅市场的均衡房价肯定会下降，但住宅的成交量则较难预测，看供给和需求的相对变动幅度了。——但有一个考虑，住宅一旦完工，其供给是缺乏弹性的，如果深圳的住宅对香港住宅是完全替代的，那么香港房价会降至与深圳一样，以求全部售出。因此，房价下跌、成交量上升局面出现的可能性最大。

毕业好久没看书了，不知回答是否正确，仅供参考！

如果深圳房子的需求量上升，那么在供应不变的情况下，均衡房价不是会上升么？如果深圳的均衡房价上升，而香港房地产对深圳的具有替代性，那么香港的均衡房价和数量不也会上升么？