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Actually, it is very easy to understand , big cities many people, relative to the small city on the scarce land resources , the per capita area of less , so the price also will be high up. Like Beijing , Guangzhou, this big city , densely populated , so the view from the monthly average price has been less than the population density is much higher second-tier cities of Foshan .

在经济规模方面，我们主要通过对比GDP，即国内生产总值。GDP是指在一定时期内，一个国家或地区的经济中所生产出的全部最终产品和劳务价值，常被工人为衡量国家经济状况的最佳指标。从这个概念我们可以知道，城市的GDP越高，既代表这个城市的经济发展的越好，经济水平提高的同时人们的收入也提高了，对于住房的需求也随之提高。可是对于人口密集的城市来说，人均占地面积少使得住房的供给和需求出现了严重的失衡。因此，房价也随之升高。房价升高后，房地产交易又带来GDP的进一步提高。

In economies of scale , we mainly by comparing the GDP, ie GDP . GDP refers to the period of time in a country or region's economy in the production of the value of all final goods and services , workers are often the best measure of national economic conditions index . From this concept we can know , the city 's GDP is higher, both on behalf of the city's economic development, the better the economy while improving the level of people's income also increased, demand for housing increases. But for the densely populated city, per capita housing area of less supply and demand makes a serious imbalance. Therefore, the prices also will rise. Price rises, the real estate transaction brings further increase of GDP .

Contrast Guangzhou and Foshan City , Guangdong Province, although the two are economic powerhouses . However, because of Guangzhou , Foshan has a more superior financial strength , banking, securities , funds, insurance and other financial institutions, the density and the number of foreign financial institutions are in the leading position. Guangzhou has a such an environment and conditions to attract a lot of talent , which also makes the overall competitiveness of Guangzhou in Foshan, compared with the greater advantage. So, Guangzhou, the city's level of economic development , GDP is also higher in Foshan city . Concentration of talent , the rapid growth of economies of scale , but also makes Guangzhou demand for housing also greater.

However, all the way to the big city economic development , GDP rises all the way , but it highlights another problem . That is, the development of small cities more slowly , this will lead to a widening gap between urban and rural areas the situation . The consequences of this vicious circle is getting higher and higher prices in big cities , small towns and the gap is growing.

From the above two reasons, raises serious agglomeration . Agglomeration effects are a common economic phenomenon , refers to the various industrial and economic activities concentrated in space to attract the economic effects of an economic activity in certain areas close to the centripetal force , leading to the formation and expanding urban fundamentals .

A city 's economic development, will inevitably create a lot of jobs, and therefore , a large number of cheap labor begins with the rural- urban migration . And a good employment environment in large cities , high-paying high welfare , it also attracts a large number of different areas of talent. Continuous influx of people , it formed a population cluster effect. In addition, because a large number of people and cheap labor , but also make a lot of companies, including leadi