The Maple City newspaper cites comparison between two cities on laws limiting the number of new buildings and average housing price as the condition to conclude that laws that limiting new building construction will have no effect on average housing prices. Evidently, such dissertation would not establish for the following reasons.
On one hand, the average housing prices is determined by geographical positions and the condition of economy. Although the average housing prices in Pine City have increased considerably since it has made strict laws planned to limit the construction of buildings. On the contrary, however Chestnut City as large as Pine City has not regulated any laws confining news building constructions’ quantity, but reaching the same average housing prices. Maybe the conditions of the two cities’ other aspects have a large distinction, but only relied on the single differentia between two assumed similar cities is not persuasive. Take China for example, if one city takes the opportunity to improve its economy at a high speed, it may attract a large quantity of talented people to settle down. Then the atmosphere appeals more well-off and gifted people to live in the neighborhood. When millionaires want to buy a house in a certain place, they will not take the money into account. Like the well known phenomenon that a group of owners of private enterprises in Wenzhou buy buildings somewhere (the construction of buildings may not be strictly restricted), the average housing price of the city will rise sharply. So the author can’t draw such inference allowing for only one condition. They are not comparable.
On the other hand, we don’t have knowledge of the history of housing prices in the two cities. Maybe the physical environment and business environment in Chestnut City is quite satisfying and Chestnut City is a newly built city (which means it has a large amount of land). So people seeking new opportunities pour into it, leading to a rise in housing prices. It is too hasty to assert that if Maple City were to establish strict laws that limit new building construction, laws will have no effect on average housing prices. .
Besides, even though the laws have some effect on the prices, there is no adequate proof that Chestnut City has not taken other measures that could raise its housing prices. For example, raising the welfares ,so it may become more appealing. The other measures may have the same effect as limiting the construction of buildings.
All in all, if the author wants to make his argumentation more reliable, he still needs to gather more information.