Comparison Analysis and Evaluation of Urban Competitiveness in Chinese Urban Clusters

With accelerating urbanization, urban competitiveness has become a worldwide academic focus. Previous studies always focused on economic factors but ignored social elements when measuring urban competitiveness. In this paper, a city was considered as a whole containing different units such as departments, individuals and economic activities, which interact with each other and affect its economic operation. Moreover, a city’s development was compared to an object’s movement, and the components were compared to different forces acting upon the object. With the analysis of the principle of object movement, this study has established a more scientific evaluation index system that involves 4 subsystems, 12 elements and 58 indexes. By using the TOPSIS method, the study has worked out the urban competitiveness of 141 cities from 28 Chinese urban clusters in 2009. According to the calculation results, these cities were divided into four levels: A, B, C, D. Furthermore, in order to analyze the competitiveness of cities and urban clusters, cities and urban clusters have been divided into four groups according to their distributive characteristics: the southeast, the northeast and Bohai Rim, the central region and the west. Suggestions and recommendations for each group are provided based on careful analysis. OPEN ACCESS Sustainability 2015, 7 4426


Introduction
Economic globalization has become a prominent trend in the 21th century.Since they function as the dominant power of political, economic, cultural and environmental development and are a significant symbol of modernization level, urban clusters have gradually become an important development strategy for national urbanization [1][2][3].As they are basic units of the urban cluster, cities' competitiveness has drawn more and more attention from scholars.In the context of urban clusters in China, the comparative competitiveness of urban clusters has usually been evaluated through the competitiveness of cities in urban clusters.Sun compared urban competitiveness among three urban clusters in China by using a factor analysis method and cluster analysis method [4].Different methods have been adopted to evaluate cities' competitiveness in the Pearl River Delta [5,6].The urban competitiveness of the Yangtze River Delta has been examined by various scholars as well [7,8].However, previous studies were mainly confined to one or more urban clusters in a particular region, and always focused on the big urban clusters such as the Pearl River Delta and the Yangtze River Delta, while ignoring other urban clusters.Moreover, comparative studies aiming at different urban clusters were even less common.Hence, a study on the urban competitiveness of urban clusters in China is extremely essential.
Many published theoretical and empirical studies on urban competitiveness have focused on two aspects: the concept and model of urban competitiveness and its empirical analysis.The concept of urban competitiveness was proposed on the basis of national competitiveness.Michael Porter argued that urban competitiveness means the productivity of a city, which refers to its ability to create wealth and increase income [9].He also pointed out that the "diamond model" is not only applicable to countries but also to regions and cities. Gordon and Paul put forward that urban competitiveness enables a city to create more income and employment than any other cities within its borders [10].Douglas Webster thought that urban competitiveness is an urban area's ability to produce more products and services and that the improvement of urban competitiveness is mainly meant to raise urban residents' living standards [11].In addition, other scholars have also contributed to the interpretation of urban competitiveness from other perspectives [12][13][14][15].
For empirical analysis of urban competitiveness, Kresl and Singh in 1999 developed a method of measuring competitiveness that involved sorting 24 large metropolitan areas in the United States and analyzed the ranking results with regression techniques [16].Tong evaluated the competitiveness of central cities in northwest areas of China since 1990 [17].Jiang and Shen examined the competitiveness of 253 Chinese cities at or above the prefecture level in 2000 by using the equal weighting method [18].Singhal et al. compared the competitiveness performance of four cities in the UK [19].A few studies on global urban competitiveness have been undertaken by scholars and research institutions [20][21][22].
Although scholars have made great progress in the theoretical and empirical study of urban competitiveness, these studies generally focused on factors that promote urban development, for example, the economic side, while ignoring factors that impede urban development, such as social problems and energy problems.We argue that engine growth, such as economic growth, does not guarantee urban competitiveness, and urban development resistance should be considered when evaluating urban competitiveness.Other conditions being equal, it is obvious that a city with less development resistance would be more competitive.Therefore, the purpose of this paper is to design a model for evaluating urban competitiveness by adopting a perspective of object movement, a model based on fully considering the forces acting on a city, including engine growth, development resistance, city interaction and environment conditions.On the basis of that model, a scientific, external and operable index system of urban competitiveness can then be constructed, and the TOPSIS method can be used to measure the competitiveness of 141 cities in 28 Chinese urban clusters in 2009.
The whole paper has been organized into five sections.Following the first section introduction, the second section introduces a three-layer hierarchical indicator system for measuring the urban competitiveness of 141 Chinese cities.The third section focuses on data sources for this study and evaluation of urban competiveness; in this section, using the TOPSIS method, the competitiveness of 141 cities in 28 Chinese urban clusters in 2009 is evaluated.After that, the comparative analysis on these cities and urban clusters is presented in the fourth section.At the end of this paper, the fifth section draws conclusions and provides suggestions for future studies.

Urban Competitiveness Model
As basic units of an urban cluster, component cities' competitiveness functions as an important indicator of the overall competitiveness of an urban cluster, and urban competitiveness manifests itself in many respects, such as economy, society, education and environment.Therefore, the question of how to build a scientific and external urban competitiveness model has attracted both domestic and international scholars.Up to now, quite a few models for evaluating urban competitiveness have been designed by previous researchers.There are some typical western models, such as the international competition evaluation system of countries' competitiveness established by the World Economic Forum and the Swiss International Management and Development Institute, the diamond model proposed by Michael Porter [23], and the urban competitiveness model designed by Rondinelli [24].By contrast, a typical model in China, proposed by Ni in the Chinese Academy of Social Sciences, is the urban competitiveness model; another is the urban value chain model designed by the Beijing International City Development Research Institute [25,26].
Most of these models have been established on the basis of the theory of competitive advantages.However, previous studies mainly focused on the advantage factors of driving forces, but ignored those of development resistances.In other words, having little development resistance is also a competitive advantage.If a city was considered as a whole, the comprehensive competitiveness of a city would be the overall performance of driving forces and development resistances.Basing on this view, this paper establishes an urban competitiveness model by regarding city development as object movement.
Since a city was considered a whole in this study and the involved departments, individuals and economic activities were considered components of the whole, it is obvious that the interaction between them has an impact on the city as a whole.Likewise, the development of the city as a whole was compared to the movement of an object, and the components of the whole (department, individuals, etc.) were compared to different forces acting upon the object.From the principle of object movement, it can be seen that the object receives not only driving and resistance forces, but also influences from external conditions and interaction with other objects.Therefore, urban competitiveness is reflected in not only its individual development but also its interaction with other cities.Based on this analysis, four dimensions-engine growth, development resistance, city interaction and environment conditionshave been chosen to measure comprehensive urban competitiveness.Engine growth is the driving forces in the development of a city, development resistance is the negative effects on urban development, city interaction reflects the ability to exchange resources nearby, and environment conditions describes quality of life; the four dimensions are further divided into 12 sub-elements (see Figure 1).A brief introduction on 12 sub-elements is given below.
Economic Strength (ES) is initially used as the primary competitive weapon, and can reflect the economic level and scale of a city.The basic indicators such as GDP growth rate and GDP are important to measure the economy's gross scale and level, and total industrial output value reflects both the degree of industrialization and urbanization.The share of the tertiary sector in GDP can also reflect the quality of urbanization.
The Role of Government (RG) reflects how efficiently the economy of a city is regulated by the government, which can be measured by five basic indicators.Financial revenue and expenditure both reflect government regulation ability.In this study, the difference between financial revenue and expenditure has not been considered, because the difference is within a controllable range in general.Thus, the financial (or expenditure) revenue and the growth rate are positive indicators for urban competitiveness.The retail price index of commodities and housing sales price index can reflect the macro-control ability for the market, and has an influence on financial revenue and expenditure.It has a positive effect on urban competitiveness.
Resident Consumption Level (RCL) plays a critical role in both economic strength and people's material standard of living for a city, which can fuel economic growth by stimulating consumption.In this study, the average wage of staff and workers, per capita disposable income of urban residents and six other indicators can reflect the status of residents' income and consumption.
Human Resources (HR) reflect the quantity and quality of workers, which can be measured by four indicators; the second industry (or the third industry) of employment proportion can also reflect labor creation ability and economic structure.
Science and Technology Strength (S&T) plays an important role in urban competitiveness.Because it is the final promoter of productivity in urban development, six indicators can reflect science and technology strength, including number of colleges and universities in the urban area.
Social Problems (SP) reflects the social security and commercial crimes in a city.The number of fires and traffic accidents, the number of civil cases and the number of criminal cases are used to measure social problems, and the three indicators have negative effects on urban competitiveness Energy Problems (EP) reflect energy gaps in urban development, which can be measured by two negative indicators: the energy gap and the power gap.
Human Problems (HP) concern labor's quality and education problems.It can be measured via the illiteracy rate and unemployment rate.
Opening to the Outside World (OOW) can best reflect how open a city is, that is, how many resources a city can provide for its neighboring cities.Urban imports and exports, domestic and foreign tourism income per year and the number of domestic and foreign tourists per year are used to measure it.Note that urban imports and exports are both profitability indicators, not considering the influence of the trade gap.
Foreign Trade Dependency (FTD) corresponds to the opening to the outside world, and represents how many advantages from resources from neighboring cities can be used to develop the city.It can be measured by the total amount of actual investment at home and abroad, actually utilized foreign investment, and urban economic concentration and diffusion ability.The urban economic concentration and diffusion reflects the economic impact on other surrounding cities.
Infrastructure (IFT) is the carriers of economic and social development.This can be measured using the area of paved roads per capita and other 6 basic indicators, which can reflect the living conditions, medical insurance and entertainment for residents in a city.
Environment level (EL) reflects the environmental pollution and management of a city.It can be measured specifically using green area per capita and five other basic indicators.

Construction of Urban Competitiveness Evaluation Indicator System
Comprehensive evaluation of urban competitiveness is a complicated system to engineer and involves a series of indicators.It is not practical to consider all the factors that influence urban competitiveness.The selection of indicators is especially important and will have a direct impact on the results of the evaluation.Therefore, this paper selected some indicators that have been widely used in the previous studies, and added a few new indicators to comprehensively determine urban competiveness.
Given that comprehensiveness, science, comparability and operability are considered the four basic principles of index selection, the index system was carefully analyzed and the appearance percentages of related indicators in 138 papers written by researchers worldwide were calculated; indicators with an appearance percentage above 10% were selected as the main indicators.Meanwhile, some new indicators were involved in order to clearly reflect other factors' impact on cities' competitiveness.Firstly, the increasing demand for land area was considered a bench-marking indicator and the house sales price index was used to evaluate the government's adjustment on real estate.Secondly, the trading volume of the commodity exchanging market was considered an indicator under Residents' Consumption Level to reflect the local consumption level.Thirdly, college and university teachers were also taken into consideration as an indicator under Science and Technology Strength to evaluate the local education resources.Fourthly, the number of criminal and civil cases was viewed as an indicator of Social Order Problems as well as a reference to local stability.Fifthly, the energy gap fell under Energy Problems to evaluate the development level of local energy.Finally, an index system involving 4 subsystems, 12 elements and 58 indexes for the purpose of measuring urban competitiveness was established in detail and shown in Table 1.

Calculation of Index Weight
The Delphi Principle has been adopted to calculate the weight of each evaluation index.Firstly, a survey on questionnaire-designing was given out to related researchers on Provincial Development and Reform Commissions (PDRC) and some professors studying regional economy.Their feedback again contributed to the improvement of the questionnaire.Secondly, the formal questionnaires were given out and the data from those experts were collected.Thirdly, the weight of each index was calculated based on Formula (1).
where n represents the number of experts, m represents the number of index, wj represents the index jth weight, cij represents the jth score graded by ith experts.
In order to obtain more scientific and authoritative opinions, through consulting experts, as mentioned above, this study firstly collected effective opinions from 36 experts from PDRCs and universities in China, of which 29 experts were from PDRCs and the other 7 from universities.According to their familiarity with the indexes, the following quantization table was designed (as shown in Table 2) and how these experts are authoritative in this area was further analyzed using Formula (2).
where CR represents the authority degree of experts, CJ is the quantitative value of judgment basis, CF is the quantitative value of familiarity.According to the results, some experts who are less familiar with the variables were excluded.In this study, experts whose CR is above 0.7 are selected.
Secondly, considering that even cities from the same region may not belong to the same urban cluster, it is obvious that the opinions of PDRC experts from regions that possess more urban clusters are more important than those of experts from other regions.For instance, cities from Henan province belong to four urban clusters respectively, meaning that opinions of experts from the Henan PDRC are more important than those of other PDRC experts.According to this point, a second round of selection was conducted.Experts from the Henan PDRC and other regions' PDRCs were selected because the numbers of urban clusters in these regions are bigger than or equal to 2. Table 3 shows the number of urban clusters in each region.According to the steps described above, the study finally identified 16 authoritative experts and the formal questionnaires were modified according to all the experts' advice.In the end, 16 official questionnaires were given out, of which 11 validated questionnaires were collected.Moreover, the 8 PDRC experts are from Henan, Shandong, Anhui, Guangdong, Jiangsu, Hubei, Zhejiang and Jilin and the other 3 are from universities.Finally, based on Formula (1), this study worked out index weight in each layer as shown in Appendix I.

Data Sample
The Blue Book of Urban Competitiveness in 2007 defined 30 urban clusters in China [27].Since the data from the Taiyuan urban cluster and Central Yunnan urban cluster is missing, this study has chosen 28 urban clusters consisted of 141 Chinese cities, nearly covering all provinces and municipalities in China (excluding Hong Kong, Macon and Taiwan).Specific information on these urban clusters and cities is provided in Appendix II.

Data Preprocessing
The data in this study were basically obtained from government documents, such as China City Statistical Yearbook of 2010 [28], China Statistical Yearbook on Environment of 2010 [29], China Energy Statistical Yearbook of 2010 [30], the Statistical Yearbooks of relevant provinces and cities, Statistical Bulletin for National Economic and Social development, municipal environment statistical bulletins, media and city soft power, etc.However, due to different statistical methods, data for some cities were actually inaccessible.Given the reliability and authenticity of this study, Table 4 demonstrates the processing modes that deal with the missing indices.The missing data was less than 3% of all data in this study.

TOPSIS Method
The TOPSIS method has been adopted for ranking the competitiveness of 141 Chinese cities in 2009.First put forward by Hwang and Yoon in 1981 [31], the TOPSIS method as one kind of MCDM (multiple criteria decision making) is a common assessment method in economic management and decision making.It defines both a positive ideal solution and a negative ideal solution and then ranks solutions on the basis of how close each alternative is to the ideal solution.If an alternative is closest to the positive ideal solution, and it is far away from negative ideal solution, then the alternative is the best solution, that is to say, the alternatives are finally ranked based on sorting the degree of closeness to ideal solution, which is calculated using Formula (3). ( where Ci represents the degree of closeness to the ideal solution, represents the distance between the alternative and the positive ideal solution, and represents the distance between the alternative and the negative ideal solution.Therefore, TOPSIS has some advantages over others such as stronger geometric explanation, less computation and better operability.What's more, TOPSIS is not restricted by sample or index numbers, which means that TOPSIS is suitable for large samples and major indexes in urban competitiveness.However, the disadvantage of TOPSIS is that it cannot fully reflect whether the alternative is good when the alternative is close to both the positive ideal solution and the negative ideal solution.In order to avoid this problem, our paper's analysis is based on classification according to ranking results, rather than the rankings (see Section 4).
The city competitiveness index system constructed in this study can be divided into three parts: the subsystem layer, the element layer and the basic index layer.In order to compare and analyze how these different indicators would impact urban competitiveness, the final score of urban competitiveness has to be calculated step by step.Specifically, the score of the element layer can be obtained through index weight and index data of the basic index layer.Similarly, through combining the index weight of the element layer, the score of the subsystem layer can be calculated by using the TOPSIS method.The specific steps are demonstrated in Figure 2.

The Ranking Results
As a result, scores for the subsystem layer and urban competitiveness were finally obtained by calculating the collected indexes and their corresponding rankings, which are shown in Appendix III.

Comparative Analysis of Calculation Results
Since rankings of cities' competitiveness have shed light on the classification of urban competitiveness, four levels (A, B, C, D) were finally defined.Among all the cities, the top 35 belonged to level A, the middle 36-70 and 71-105 belonged to level B and level C respectively, while the bottom 106-141 belonged to level D.

Overview of Urban Competitiveness
Based on cities' rankings and levels of competitiveness, Figure 3 shows the distributive characteristics of urban competitiveness.More than half of the A-level cities , nearly a third of the B-level cities and ten or more of the C-level cities are located in the southeast area of China, mainly because most cities obviously have enjoyed various geographic advantages and superior industrial foundations in this area.The central area has the largest A-level cities except the southeast area, but it also has the largest D-level cities, and the number is about half.According to this, urban competitiveness in the central area is very unbalanced.With the rise of the central region strategy, there is a great opportunity for cities in this area to promote their development and competiveness.The competitiveness of cities in the Bohai Rim area is mainly at the B and C levels.The overall competitiveness of this area is obviously weaker than that of the southeast, but is stronger than the central area and other regions.Cities in this area should strengthen their economic cooperation and enhance their competitiveness to increase their number of A-level cities.The remaining three regions have more than half C-level and D-level cities, especially the southeast area, which has 4 C-level and 7 D-level cities, while the total number of this area is 15.Due to constraints in geographical location, resource conditions and policy reasons, cities in the west region are still undeveloped.It is necessary for less advanced cities to develop their economies, because economy is the foundation of both social and culture development.

Relationship among the Four Dimensions of Urban Competitiveness
The urban competitiveness score is calculated by integrating engine growth, development resistance, city interaction and environment conditions.According to this, it is necessary for a city to achieve good performance in all dimensions for higher urban competitiveness.However, there are many possible trade-offs in the process of urban development, which lead to unbalanced development of different dimensions.For example, the contradiction between economic growth and environmental protection is prominent in developing countries such as China.Therefore, the relationship among four dimensions in urban competitiveness has been examined directly by correlation coefficient and scatter plot in this section.The Pearson correlation coefficients of the scores of overall competitiveness and four components were calculated.Given that cities with different levels of competitiveness may have differences in the relationships among dimensions, the analysis of relationships among dimensions is divided into five groups according to cities' levels of competitiveness.
(1) Relationships among the four dimensions of urban competitiveness of 141 cities.
The calculation result reveals that engine growth, city interaction and environment conditions are positively correlated and statistically significant at 0.05, and the relationship between urban competitiveness and the four dimensions is also positive.However, the relationship between development resistance and other dimensions are weak, which also can be seen from the Figure 4. Figure 4 shows that there is an obvious linear positive correlation between urban competitiveness and engine growth, with a Pearson correlation coefficient of 0.92.Similarly, the engine growth and city interaction present a positive correlation at a Pearson correlation coefficient of 0.81.This is probably because engine growth and city interaction are closely related and interactive with each other.The relationship between engine growth and environmental conditions (0.58) was closer than the correlation between city interaction and environmental conditions (0.41).Perhaps a city with better performance in EG and city interaction will help provide better environmental conditions.(2) Relationships among the four dimensions of urban competitiveness of A-level cities Similar to the result of 141 cities, Figure 5 shows that urban competitiveness has a strong linear positive correlation with engine growth, city interaction and environmental conditions, but has a weak negative correlation with development resistance.Moreover，engine growth and city interaction both have a negative correlation with development resistance, and the correlation coefficients are respectively 0.36 and 0.34.According to the ranking result in every dimensions of urban competitiveness, this reveals that some A-level cities may have unbalanced performance, with DR rank far behind.For instance, Guangzhou, Shenzhen, Beijing and Tianjin, the rank of development resistance are all after 90.The quick development of a city may produce some negative effects, such as social problems and energy shortages, which will increase development resistance.(3) Relationships among the four dimensions of urban competitiveness of B-level cities Compared with the two cases introduced, urban competitiveness has a weaker positive correlation with engine growth and city interaction.Figure 6 shows that the relationship between urban competitiveness and development resistance, urban competitiveness and environmental conditions are not correlated, which indicates that the urban competitiveness of B-level cities is more unbalanced in all dimensions.In addition, the negative correlation between engine growth and environmental conditions confirms that these cities may achieve rapid development at the expense of the environment.It is necessary for these cities to pay more attention to the environment while developing their economy.(4) Relationships among the four dimensions of urban competitiveness of C-level cities Figure 7 shows that urban competitiveness has a weaker positive relationship with engine growth, city interaction and environmental conditions.But according to the calculation of the correlation coefficient, only the relationship between urban competitiveness and EC is at a significant level of 0.05, with a correlation coefficient of 0.45.That is to say, the urban competitiveness of C-level cities mainly depends on environmental conditions.Engine growth has a negative relationship with development resistance and environmental conditions, suggesting that these cities are currently in the developing period, because there are some conflicts among these dimensions which have restricted the overall development of the city.(5) Relationships among the four dimensions of urban competitiveness of D-level cities Urban competitiveness has a strong positive relationship with development resistance that is different from other cities with other levels (as shown in figure 8).Meanwhile, the scores for both environmental conditions and development resistance are low, similar to the overall urban competitiveness.Due to their late start, these cities ranked far behind in all four dimensions.The different dimensions are also almost uncorrelated.Therefore, specific advantages of these cities should be identified and fully taken advantage of to achieve their balanced development in other aspects.

Conclusions
Based on previous study models of urban competitiveness, this study has designed and established an evaluation system for urban competitiveness involving 12 indicators in the element layer and 58 indicators in the basic index layer.It adopted the TOPSIS method to evaluate cities' competitiveness in 28 urban clusters (including 141 Chinese cities) in 2009.Based on measurement results, four levels (A, B, C, and D) have been defined to conduct comparative analysis between cities in different regions.In addition, the relationship among different dimensions has been examined and analyzed using scatter plots and the Pearson correlation coefficient.Based on their own situations, different urban clusters and cities should improve their overall competitiveness by enhancing the competitiveness of other relevant dimensions.No doubt there are flaws in the study and further improvement is necessary.For future research, Yunnan city clusters and Taiyuan city clusters should be taken into consideration, and a comprehensive and dynamic evaluation should be performed for demonstrating long-term urban competitiveness.
, EG = Engine Growth, DR = Development Resistance, CI = City Interactions, EC = Environmental Conditions, ES = Economic Strength, RG = The Role of Government, RCL = Resident Consumption Level, HR = Human Resources, S&T = Science and Technology Strength, SOP = Social Order Problems, EP = Energy Problems, HP = Human Problems, OOW = Opening to the Outside World, FTD = Foreign Trade Dependency, IFT = Infrastructure, EL = Environment Level.

Figure 2 .
Figure 2. Calculation process of urban competitiveness.

Figure 3 .
Figure 3. Area profile of each level.

Figure 4 .
Figure 4.The scatter plot of dimensions of 141 cities.

Figure 5 .
Figure 5.The scatter plot of dimensions of A-level cities.

Figure 6 .
Figure 6.The scatter plot of dimensions of B-level cities.

Figure 7 .
Figure 7.The scatter plot of dimensions of C-level cities.

Figure 8 .
Figure 8.The scatter plot of dimensions of D-level cities.

Table 1 .
Index system of urban competitiveness.
UC EG ES GDP (x1); GDP growth rate (x2); GDP per capita (x3); Share of secondary sector in GDP (x4); Share of tertiary sector in GDP (x5); total industrial output value (x6) RG Financial revenue of local government per capita (x7); Financial expenditure of local government per capita (x8); Retail price index of commodities (x9); Housing sales price index (x10); Local financial revenue growth rate (x11); Local financial expenditure growth rate (x12); The ruling government satisfaction (x13) RCL Average wage of staff and workers (x14); Urban consumer price index (x15); Per capita disposable income of urban residents (x16); Per capita consumption expenditure of urban residents (x17); Engel coefficient of urban households (x18); Total retail sales of social consumer goods (x19); Total retail sales of social consumer goods per capita (x20); Total transaction amount of commodity trading market (x21) HR The second industry employment proportion (x22); The third industry employment proportion (x23); On-the-job workers proportion (x24); Number of on-the-job workers at end of the year (x25) S&T Number of colleges and universities (x26); Number of teachers in colleges and universities (x27); Number of patent applications (x28); Number of authorized patents and technology projects (x29); Number of all types of professional and
EL Area of green land per capita (x53); Percentage of greenery coverage in the built-up area (x54); Percentage of industrial sewage discharged meeting national standard (x55); Number of fine air days per year (x56); Solid waste comprehensive utilization rate (x57); Output of products that comprehensively utilized the "three wastes" (x58) Note: In Table 1, UC = Urban Competitiveness

Table 2 .
The quantization of expert's familiarity with each index.

Table 3 .
The number of urban clusters in each region.

Table 3 ,
Num = the number of urban clusters

Table 4 .
Processing mode for missing indices.

Table A1 .
Index weights in each layer.

layer Element layer Basic index layer Subsystem layer Element layer Basic index layer
express indexes that correspond to the indexes of the basic index layer in Table1.

Table A2 .
Urban clusters and cities.

Table A3 .
Score of urban competitiveness.