Industrial agglomeration has been a hot topic in the academic discussion, while the agglomeration externalities in which hold an important role. The discussion about externalities can be traced back to the Marshall (1890), in his view, the three reasons for agglomeration economy is the market of labor pool, intermediates and knowledge overflow. And The Theory of Endogenous Growth highlights the importance of knowledge spillover in economic growth. According to Tibor Scitovsky’s  point, externality is usually divided into monetary externality and technical externality, monetary externality refers to the industry association, mainly through the price mechanism to reduce the enterprise cost, and technical externality is based on the technological spillover and diffusion of association . New Economic Geography Theory mainly examines the monetary externalities in agglomeration, not talk much about the technology externality. According to the different sources, technical externalities can be divided into three types: Marshall externalities (MAR), Jacobs externalities (Jacobs), and Potter externalities (Porter).MAR externalities   thinks that the knowledge spillover between same industries can promote technology progress and innovation. Also the regional monopoly hold a role in economic growth; Jacobs  insisted that the knowledge spillover happens in different industries can promote innovation and economic growth; Porter  argued that highly competitive in the same industry can promote technology innovation, and shared the same point with Jacobs that the regional monopoly hinders the technical progress.
Three kinds of externality have always caught the attention of scholars at home and abroad, and different scholars with different data and methods get different results. So the specific role of the three externalities has not yet written a conclusion. The empirical study on externality mainly focuses on the two aspects: one is to study the relationship between the three externalities and the regional or industrial economic growth, and the other is to explore impact of the externalities on innovation. In a study of externality in regional or industrial economic growth, Wu Sannang, Li Shan Tong  found the positive impact of MAR externality on manufacturing output growth. Xie Pin  revealed that there is an inverted U-shaped relationship between industry specialization and economic growth; Octávio Figueiredo et al.  found that MAR externality has a significant positive impact on the growth of the industry output, Also, some scholars found that MAR externality and Jacobs externality are good for economic growth  . In this paper, the author points out that the localization of the industry has a positive effect on the industry. The On the externalities of empirical research on innovation, some scholars come to a similar result, found that MAR externality and Jacobs externality has a significant positive role in promoting for the industry or the enterprise level of innovation   .
Based on TFP, we can measure the quality of economic growth more comprehensively. This paper chooses to study the influence of three kinds of externalities on the TFP of Chinese manufacturing industry. This paper divides manufacturing into labor-intensive, capital-intensive and technology-intensive industries, and uses the spatial measurement model to explain the relationship between externality and Chinese manufacturing Economic growth.
2. Model Building, Variables and Data Description
2.1. Spatial Model
In this paper, we refer to the research model of Miller, Upadhyay , Mao Qilin, Sheng Bin , what we get as follows.
refers to initial productivity， is the influence degree of exogenous variable to productivity, , , are the degree of three externalities impacts technology. We get the logarithm of both sides,
This paper mainly studies the influence of technology externalities on the TFP of manufacturing in China. At the same time, according to other literature, we choose the opening degree (open), the state capital ratio (stat) and the human capital (hr) as the control variables. The final measurement model is as follows:
2.2. Variables and Data Description
For dependent variable. This paper chooses the Solow residual method to measure TFP. So this paper needs the output Y, labor input L and capital input K. we choose the total output, the number of employees, and the capital stock ; while Independent variable. In this paper, the majority of the literature selected by the location of the business to calculate MAR externality, we select the relative diversification index to express Jacobs externality. For Porter externalities, this paper chooses the use of j regional i industrial enterprise employees and the national i industrial enterprises the ratio of the number of employees employed to measure.
According to the intensity of production factors, this paper will be divided into labor-intensive manufacturing, capital-intensive and technology-intensive three industries. This paper is based on the annual survey of China’s economic census in 2003, 2008 and 2013, as well as three years of economic census bulletin, economic census yearbook and provincial statistical yearbook. The final research area includes 29 provinces (Tibet, Hainan and Hong Kong, Macao and Taiwan regions are not considered).
3. Spatial Autocorrelation Test and Regression Analysis
3.1. Spatial Autocorrelation Test
This article uses the Moran’s I to test the global autocorrelation of TFP in 2004, 2008 and 2013. According to the 2004, 2008 and 2013 manufacturing TFP in 29 provinces in China, we can get Table 1.
From the Table 1, The Moran’s I index are positive and all through the 5% significance level. This indicates that there is a significant positive spatial cor-
relation among TFP in 29 provinces, that is, there is a significant spatial agglomeration effect.
3.2. Regression Analysis
According to Wald test and Housman test, we can find the most suitable model (Table 2).
Table 1. Moran’s I index.
We can get the conclusion that the manufacturing industry as a whole, capital-intensive industries and technology-intensive industries are SDM fixed effect model, labor-intensive industries for the SAR random effects model.
It can be seen from Table 3 that the spatial lag regression coefficients are positive, indicating that there is a significant spatial spillover effect among the TFP in the neighboring regions. In terms of regression results, industrial specialization has a significant effect on the manufacturing sector as well as the three types of industries at the significance level of significance. The direction of labor-in- tensive and technology-intensive industries is positive, the manufacturing industry and the capital one is negative. Market competition in technology-inten- sive industries have a significant positive effect.
The results show that the spatial spillover effect of industry specialization is significant and the direction is negative, indicating the degree of industry specialization is hard to the growth of TFP. From the impact on the overall structure, the degree of industrial specialization has a significant negative effects on the TFP to the whole.
For labor-intensive industries, industry specialization has a positive effect on TFP growth, indicating that the local industrial specialization can promote the TFP growth near area. The specialization of industry in local area and the agglomeration of talent have the same effect on the TFP in other regions. The effect of the overall effect is the same to that of the direct effect; look from Table 4, we also get the results of capital-intensive industries. The direct effect of industry
Table 2. Test result.
Table 3. Regression result
Table 4. Effect disintegration.
specialization is significant. The higher of the degree to specialization in the local industry, the greater inhibitory effect on the local TFP; from the point of technology-intensive industries, the local industrial specialization and market competition have a significant positive effect on the overall TFP growth, while industrial diversification has a negative impact. To the overall structure, industry specialization and the market competition environment has a significant role in promoting the TFP growth.
4. Conclusions and Suggestions
Through this paper, we find that the influence of the three externality to the whole manufacturing industry is not significant. Only the negative effect of the industry specialization is to reduce the overall factor productivity of the whole industry. The specific impact of the three externalities on the total factor productivity of the manufacturing industry will result in different results due to the different types of industries.
Increasing the level of specialization of the industry has a positive effect on the growth of the TFP to the labor-intensive industries. The main advantage of the labor-intensive industry lies in the labor force, because the geographically close, cooperative relations are close, and the labor force is within the region Liquidity, easier industrial technology spillovers, promote technical exchanges, more advanced production methods and skills can be quickly spread between enterprises, resulting in technological progress, reduce production costs, improve production efficiency; reduce industry specialization Has a positive impact on the growth of total factor productivity in capital-intensive industries. The advantage of capital-intensive industries is that capital resources are invested more,
including fixed assets and current assets. Capital-intensive industries are geographically aggregated, which may lead to higher resource consumption and pollution tendencies, while environmental protection capacity and environmental recovery capacity are not synchronized with resource consumption and environmental pollution, resulting in negative externalities to the environment Production costs will increase, production efficiency is low; high industry specialization and strong competitive environment is conducive to technology-in- tensive industries to improve the total factor productivity. The high competitive environment caused by the aggregation of the same industry will cause the enterprise to have a sensitive effect on any action of the opponent’s business. An enterprise’s technological innovation will soon be understood by other enterprises. The gathering leads to the high-speed technology diffusion and new technology The monopoly profits will soon disappear, so as to further stimulate the technological progress of enterprises, and each rival enterprise’s technological progress are the pressure of enterprise development, but also the driving force of technological innovation, competition forced enterprises to take the initiative to develop Rather than passive absorption of other people’s technology spillovers, passive absorption of other companies technology spillovers, imitation innovation in the time dimension will lag behind the competitors, cannot be foothold in the industry.
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