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Argument109:： The following appeared in a letter to the editor of the Maple City newspaper. Twenty years ago Pine City established strict laws designed to limit the number of new buildings that could be constructed in the city. Since that time the average housing prices in Pine City have increased considerably. Chestnut City, which is about the same size as Pine City, has over the past twenty years experienced an increase in average housing prices similar to Pine City, but Chestnut City never established any laws that limit new building construction. So it is clear that laws limiting new construction have no effect on average housing prices. So if Maple City were to establish strict laws that limit new building construction, these laws will have no effect on average housing prices. 20年前Pine City建立了严格的法令来限制该市未来建造的高层建筑的数量。从那以后Pine City的平均房价显著上涨。和Pine City差不多同等规模的Chestnut City在过去20年中经历了和Pine City类似的房价上涨，但Chestnut City从未建立任何限制高层建筑的法令。因此限制建造高层建筑的法令对于平均房价没有影响。所以如果Maple City建立限制新的高层建筑的法令的话，这种法令不会影响平均房价。 ① Laws limiting new construction have no effect on average housing prices. | 
