A Study On The Relationship Between The Economic Agglomerations And The Population Aggregation

The population problem is a significant, matter that affects the situation as a long-term strategic issues, population development is closely related to social and economic development, is a key variable of many influence factors in economic and social development. This paper expatiates on the economic aggregate and population on the basis of the concept of both the research and analysis of the relationship. Economy gathered also called gathered economic benefit, is refers to the enterprise benefits as a result of the focus to a particular region, is the important reason of urban existence and development and motivation, is a kind of by obtaining economies of scope and economies of scale to improve efficiency and reduce the cost of power system. The so-called population refers to the population by space on decentralized to centralized, sparsely to densely populated a social economic phenomenon. Population consists of two large, population size and population density benefits, from the form, the increase of population is regional population strength, but a series of great social and economic benefits.Before further in-depth analysis, this paper puts forward the viewpoint needs to clarify three premises:first, claims that population must be in the total population moderate conditions, the transition conditions rather than the total population. Is certainly population to the city’s economic development can promote, the more the better but it doesn’t mean the size of population, and argues that the best population is under the condition of moderate population of population, because when the population moderate, resources and environment to provide economic and continuous development of power, social economy can keep sustainable development. Second, the moderate population does not mean that the population density is bigger, the better, not population aggregation degree is higher, the better. Is population effect are implemented under the appropriate population density, and high population density can produce negative population effect. Third, we believe that the level of development of society and population aggregation effect, advocated by the actual economic growth and the actual development of the society to realize the people gathered themselves together, and make the population gathering has substantial content, to the social economy can really play a promoting and leading role, rather than the use of coercive population aggregation of administrative commands.This article USES is the sixth census of Chengdu and the related economic data on the relationship between the population and economy, therefore, in the understanding of the basic economic industry of Chengdu, and, on the basis of demographics, the Chengdu economic-population distribution coordination degree has carried on the estimate. Then, the main part of the article considering Shukla (v. Shukla,1984) on the basis of economic aggregation function, and puts forward the function form of economic aggregate, again through the log processing and converting output per capita output after get estimation model used in this paper. Based on Chengdu sixth census data, the empirical analysis of the Chengdu economic aggregate and the relationship between the population. In districts and counties of Chengdu are related to the population and economic data to construct the regression equation, the aggregation degree of districts and counties of Chengdu economy, to verify the division of three layers of Chengdu. Then to Chengdu and other demographic and economic data of deputy provincial city transverse comparison, Chengdu economic and population aggregation degree and aggregation degree and differences in other cities, and then verify economic relationship with population, further into the level of industrial structure and analyzes the cause of these differences.In promoting city development, promote the building of urbanization path, we must pay attention to urban functions and give full play to the efficiency. Suitable for a certain or some sort of city size may not be suitable for other cities, some optimal size in a period may not be the optimal city size in the future, in a way, although theoretically there exists the optimal city size, but the optimal scale is also changing, which show the dynamic optimal scale. While existing theory studies have proved that agglomeration economy for economic growth has a promoting role, but based on national data and internal data of empirical research is not consistent with the results, and, based on the data of China’s population and economic relationship between aggregate analysis of the research is not much, in this paper, the research to make up for the defects. But at the same time, we should also note that, this article discusses the economic aggregation model is a simplified model, apparently does not include all of the characteristics of the urban economy, in the model, we only used to represent the degree of population, population densities by non-agricultural output per capita economic aggregate level, but the reality in the city there are more and more complex factors at work, so more mature model should contain more factors.Not only based on the study of descriptive statistic method, this paper also has economic aggregate is obtained by data fitting to correlation coefficient between the population density estimate. Throughout the study, released by Chengdu sixth census data and statistical yearbook published in Chengdu is founded on the basis of the data, according to the permanent population,2010, Chengdu economy-the population distribution and coordination of the deviation index value is0.36, namely economies of scale and the population size of Chengdu is relatively a coordination level.Among them, the population density distribution performance of Chengdu, the differences between the layers of dense thin outside in. The districts and counties of Chengdu from2006to2006, the trend of the development of the population scale and non-agricultural production value contrast around the figure, we can know, population scale and the region corresponding to the non-agricultural production value generally show a positive correlation relationship, namely in the districts and counties of Chengdu, the greater the population size, the proportion of non-agricultural production value is also higher. Population density is strongly influenced by social and economic development level, population density and GDP of Chengdu has a certain relevance, which can be concluded that the positive relationship of population and economic aggregation is such an inference, they can influence each other between them, namely the population can promote economic aggregate, economic aggregate reaction in population, thus forming the agglomeration economy.In our population density data is adopted as a measure of population is an important indicator of building the economic aggregate and the relation between population equation, the result shows that the population density of logarithmic term as one of independent variable b1corresponding coefficient is2.3565, just verify before we conclude, is a certain degree of population to economic aggregate has a positive role in promoting, at the same time, we also should pay attention to the quadratic term in the equation of coefficient of b2represent meaning-the binomial coefficient is negative, that population gathered the promoting effect of the economy there is a critical value, that is to say, not blindly increase the degree of population can achieve higher level of economic gathered themselves together, and when the people gathered for the promotion of economic aggregation function at its highest point, then promote the population will not be able to effectively improve the level of economic aggregate, or even to cause a decline in economic aggregate benefit. This also happens to verify our city should have moderate population scale guess, only controlling the population density in the reasonable scope, to promoting effect to the urban economy, this view is consistent with real situation. At the same time the urbanization in China is also a revelation, or very large scale of city although can absorb more demographic population benefit can be obtained, but when city overload carrying too much population, this benefit is limited to the promotion of city economy, population is likely to produce many of the environment, the negative externality problems such as traffic, public security economic benefit has not grown much.Through this paper constructed the relationship between population density and economic aggregation level equation we can estimate the economic aggregation degree of the districts and counties of Chengdu. Judging from the results, the economic aggregation degree of the top five were belong to the center of the city of Chengdu, and the economic aggregate level is above15000, the same we can be observed, according to the economic aggregate level sort results coincide with the distribution of the three spheres of Chengdu is consistent, the second circle of the six counties of the economic aggregate levels of value between12000and15000, the third sphere of8counties economic aggregate level is low. The result also happens to verify what we think of the relationship between the population and economic aggregation. Due to the high degree of central urban area of Chengdu’s population, and thus its economic aggregate level is higher accordingly.2, because the three spheres of low population density, economic aggregate and corresponding lower level. The on the other hand, because the city center is the second, three spheres of economic aggregation degree is higher, the economy more developed, so can more attract the influx of population, which has a higher population gathered strength.In Chengdu, in the essay and compared with that of the other vice provincial cities in our country, per capita GDP and population density of corresponding relation is not obvious, the basic is the greater the population density, the higher the per capita GDP of the probability is relatively larger, at least, not the opposite relationship.From sorting table of comparison we can know, the cities gathered in accordance with the economic level and in accordance with the population density of ranking is almost consistent, this also confirmed that the population and economic aggregation is one of the positive correlation relationship, when the higher level of population, economic aggregate level is higher. Gathered from the resident population and economy level in both ranking sequence alignment, there is no obvious corresponding relation, which proves that the greater the population size, do not necessarily represent will have gathered population can bring higher economic level, which will take into account the geographical and regional factors, considering the geographic area after the index of population density, degree of corresponding gathering economic development better. Both sections from the level of economic aggregate and per capita GDP of the comparison view, the ranking still exists a certain degree of difference, this explains why don’t we in the above model using GDP per capita is non-agricultural employed by the per capita output value as the dependent variable. Because in the process of examining economic aggregation, we focus on the object is in the city. Due to urban industrial layout is different from the countryside, more forms of industry for the second and third industry, especially the third industry to produce more population absorption effect, strength is more outstanding, the call of population and due to the limitations of the geographical distribution of resources, such as the urban land is not possible to a large number of land used for agricultural production, combined with the reality to analyze, we gather in the city’s economic level, the data is not included agriculture of nonagricultural output. This helps explain why the economy gathered in the great cities of the level and the region’s GDP, per capita GDP ranking, there is a difference, all are not consistent.From this article’s conclusion, overall of Chengdu have realized dominated by the tertiary industry employment structure, compared with the part of the deputy provincial cities in China, the proportion of non-agricultural population of Chengdu is in medium level, the urbanization level rise space is very big. Three structure optimize, industry practitioners sectoral distribution personnel structure is relatively balanced, has realized the overall dominated by the tertiary industry employment structure. Diversification of employment structure in Chengdu at the same time, the industry’s labor absorption capacity but it remains to be improved.In order to better promote economic gathered themselves together, and realize the sustainable development of cities, we should correctly understand the population growth, the reasonable layout of population development, and the management of population, and promote industrial distribution and employment structure optimization. By this paper can get some inspiration in the urban construction of Chengdu:1. The reasonable layout of the three spheres of population size, population to urban agglomeration;2. To further optimize the employment structure, and actively expand employment;3. Through the policy support, building open pattern of talent exchange and cooperation;4.perfect human resources safeguard measures, to do a good job of floating population service and management.