<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>