Relationship between Logistics and Economic Growth on the Silk Road Economic Belt

The government attaches great importance to “The Silk Road Economic Belt”, especially the role of logistics that influences economic growth. This paper selects the data of transportation investment and economic growth in Xi’an from 1993 to 2013. And I use the Unit root test, the VAR model and the Granger causality test. The research results show that the economic growth has caused the development of the logistics industry.


Introduction
In September 2013, the President Xi Jinping visited to Kazakhstan, the first initiative to build a "Silk Road Economic Belt" during a speech at the Nazarbayev University [1].The action reflected the bright future of opening up China to the west.In the concept of the "The Silk Road Economic Belt", the logistics industry is to promote economic growth with a breakthrough, especially in the recent years, government increases investment in central transportation infrastructure.
Xi'an is the construction of the Silk Road economic zone, which is expected to become the biggest beneficiary.At the same time, Xi'an is the well-known ancient Silk Road starting point and it can represent the gateway city at the Guanzhong-Tianshui Economic Zone.This paper focuses on the relationship between the logistics industry and economic growth of Xi'an.This paper provides suggestions for the government to develop the economy of Xi'an.

The Concept of "The Silk Road Economic Belt"
Historic Silk Road refers to ancient China starting in the economic, political and cultural center-the ancient capital of Chang'an (now Xi'an) overland commercial channels.China's world-famous ancient silk, Silk Road, hence the name.300 years BC, China's silk was transported to ancient India.In the Western Han Dynasty, Zhang Qian's diplomatic mission to the Western Regions, making the Chinese civilization and Central Asia, West Asia have a more intimate contact with civilization, and provide the dissemination of Chinese civilization.At the same time, Silk Road reached prosperous period."Silk Road economic belt" in the "Silk Road" basis put forward."Silk Road economic belt" points in Central Asia, South Asia, West Asia, Europe and Asia, especially in Central Asia.
Basic connotation "The Silk Road Economic Belt" is to strengthen the five parts [2]: policy communications, roads connection, trade flow, currency in circulation and the people connected.Policy communications for the construction of "The Silk Road economic belt" is very important that each country has its own economic policy.If the basic policy of communication do not go well, then it is difficult to continue the economic and cultural exchanges.In recent years, the efforts of China and the Central Asian countries, China-Central Asia along the transportation infrastructure segment improved greatly promoted bilateral and multilateral trade.Strengthen trade flow."The Silk Road Economic Belt" The market potential is huge, the economic belt attached to the east of the Asia-Pacific Economic Circle, west attached developed European economic circle.China has become Kazakhstan's largest trading partner of Turkmenistan, Uzbekistan, Kyrgyzstan's second largest trading partner, third largest trading partner in Tajikistan.Strengthen the currency in circulation.The role of finance in modern economic development is becoming increasingly important to strengthen financial cooperation between countries is necessary.If countries achieve local currency settlement, then it can greatly reduce transaction costs, but also can enhance the ability to resist financial risks.Strengthen the people connected."The Silk Road Economic Belt" must be supported by all peoples, in order to carry out a wide range of people is the starting point and goal of all our work.

Situation Analysis of "The Silk Road Economic Belt"
"The Silk Road Economic Belt" of the total population of nearly 30 million [3].Based on the ancient Silk Road, the formation of regional economic cooperation between China and other countries in the Midwest, it is considered to be the world's longest, most development potential of the economy large corridor and a special economic zone area.
By the end of 2014, the total population of five northwestern provinces 98.42 million is which is located on the "The Silk Road Economic Belt", accounting for 7.2% of the total population; a total area of 3,079,000 square kilometers.According to statistics, in 2014 GDP of the five northwestern provinces reached 3.9 trillion yuan, as shown in Ta-ble 1. Rapid economic growth benefited "The Silk Road Economic Belt" and the logistics industry has provided a broad space for economic development.Xi'an is the largest city in the Northwest Province, which is the cultural history of the international metropolis.Xi'an connects the north and south of the "Grand Cross" rail network and Shaanxi Province, which shows "rice-shaped" an important hub for rail transport of the country and the national trunk road network one of the largest urban nodes.It is also the center of the Eurasian Continental Bridge, which is an important strategic position.In 2013, the total annual cargo transport Xi'an 50119 million tons, an increase of 11.6%; cargo transportation turnover 64,714,970 million tons km, an increase of 8.6%, as shown in Table 3.   4, Figure 1).

Methodology
This paper built VAR model to analyze the relationship between the logistics industry and economic growth.And I use E-Views econometric software.
VAR models are a number of variables on the current period lagged variable regression, and consider the impact of their endogenous lagged variable for the current varia-

Stability Test
Stationary time series refers to the mean of a time series, whether the variance and auto covariance is stable.If a time series with a stable mean, variance and auto covariance, then this sequence is stable, or is unsteady.
In order to reduce the volatility of the data, the data processing logarithmic, LGDP = log (GDP), LJCY = log (JCY).
With E-Views econometric software analysis, the results obtained are as follows (Table 5).
Table 5. ADF unit root test.

Variables ADF test value
The 5% level of confidence The 10% level of confidence Conclusion Table 5 shows that, ADF value of LGDP equal to 0.553385, ADF value of LJCY equal to −0.466096, are greater than the critical value of 5% confidence level, indicating that in 1993-2013 years, the logistics industry and economic growth in Xi'an sequence is not smooth, so it is non-stationary nature sequence.So I have to do first-order differential.
Then we know that DLGDP equal to −3.250449, DLJCY equal to −5.226985, and they are less than the critical value under the 5% level.So these two time series after the first difference stationary series are stable.So they can be used in the Granger causality test.LGDP 0.0376 0.0071LJCY 1.2577LGDP

VAR Model
From the VAR model, we know that LJCY is positively affected by the previous period, but also by LGDP negative impact of the previous period.
LGDP is positively affected by its previous period and it also positively affected by the previous period of LJCY.

Granger Causality Test
If the variable X helps to predict Y, that is to say, the regression of Y is based on past values of Y.If coupled with past values of X, the results can significantly enhance the explanatory power of regression.Then X is the Granger cause of Y, otherwise known as non Granger reasons.
With E-Views econometric software analysis, the results obtained are as follows (Table 6).When the lag period is 1, the probability of Granger cause is 0.0151 when LGDP is not the cause of LJCY, less than the significance level of 0.05.So it is need to reject the null hypothesis of LGDP is not the reason of LJCY, that's to say, LGDP is the Granger cause of LJCY.Similarly, the probability of Granger cause is 0.73450 when LJCY is not the cause of LGDP, greater than the significance level of 0.05.So we need to accept the null hypothesis that LJCY is not the Granger cause of LGDP.

Conclusion
There is a strong correction between logistics industry and economic growth on the "Silk Road Economic Belt".By Granger causality test, it shows that the economic growth of Xi'an promotes the development of the logistics industry, and the development of the logistics industry does not play a significant role in promoting economic growth.For the reason why development of the logistics industry in Xi'an does not play a significant role in promoting economic growth, we can interpret from the following aspects.

Lack of Unified Planning and Layout of Logistics
Currently, Xi'an is short of logistics network construction planning, more not been coordinated, resulting in that a fragmented district logistics basic state become a serious obstacle to the scientific development of the logistics industry in Xi'an.And this situation leads to the logistics enterprise generated internally huge waste and loss.

Low Degree of Logistics Socialization
At present, the business reached more than 500 million is few among the medium-sized enterprises logistics companies in Xi'an.There are much fewer logistics enterprises that can provide two or more logistics functions and information services, not to mention carrying out a third-party logistics business.The majority enterprises are small-scale logistics enterprises and their business is single.

3. 1 .
Data Selection I select the Xi'an as the sample and the time span is 1993 to 2013 year.And the data source is Xi'an statistical yearbook.According to Xi'an domestic research literature on the logistics measure indicators, taking into account the diversity of logistics indicators, based on previous research [4], this paper choose transportation, storage and postal services as an indicator of investment in fixed assets of the logistics industry, denoted JCY, select gross domestic product (GDP) as a measure of economic growth indicator, denoted by GDP (Table

Figure 1 .
Figure 1.GDP and investment in transport infrastructure in Xi'an from 1993 to 2013.
At the same time, the total social consumer goods retail sales of five northwestern provinces reached 1.04 trillion yuan in 2013, as shown in Table2.Northwest consumer market activity, retail sales continued to grow steadily, which is good for the development of the logistics industry on "The Silk Road Economic Belt".

Table 2 .
The total social retail goods sales and nominal growth of five northwestern provinces.
Source: China Statistical Yearbook.

Table 3 .
Highway, railway and civil aviation traffic growth in 2013.

Table 4 .
GDP and investment in transport infrastructure of Xi'an during 1993-2013.
Source: Xi'an Statistical Yearbook.
Vector autoregression model called VAR model, is a commonly used econometric models, 1980 by Christopher Sims proposed.VAR model is the model which including number of all the income variables lagged regression variables for all variables.