Export diversity and ubiquity of agricultural products and agricultural growth
(2.Economic and management school of Wuhan University)
【Abstract】The kinds of export of agricultural products (diversity) in different countries and the supplier of each agricultural product (ubiquity) are different. Few studies pointed out the importance of the export ubiquity of agricultural products on the export diversity. This paper used the data on 394 kinds of agricultural products in 164 countries from 1986 to 2012 to construct a simple theoretical model, which described how the export diversity of agricultural products affected agricultural growth through export ubiquity. Analytical results showed that the export diversity of agricultural products had a significant effect on agricultural growth. In countries with high export ubiquity, the export diversity of agricultural products had insignificant influences on agricultural growth. While in countries with low export ubiquity, the influence was significant and positive. Besides, that the export diversity of agricultural products promotes agricultural growth was based on trade protection.
【Keywords】 export of agricultural product; export diversity; agricultural growth; export ubiquity;
. ① With regard to export diversity, Dennis and Shepherd (2007) defined it as an increase in the scope of products exported of a country. However, according to the structure of export, export diversity can also be divided into horizontal diversity and vertical diversity (Herzer and Nowak-Lehnmann, 2006). Horizontal diversity refers to the increase in the kinds of products exported, while vertical diversity refers to the change in the ratio between the exported primary products and industrial products. The export diversity of agricultural products studied in this paper refers to the horizontal diversity, namely, the kinds of agricultural products exported. [^Back]
. ② The Ricardo model measures the comparative advantage from the perspective of labor productivity. The Heckscher-Ohlin model measures the comparative advantage from the perspective of resource endowments. [^Back]
. ① By calculating the ratio between the value of agricultural raw materials exported to the agricultural output value in 164 countries from 1986 to 2012, it was found that the ratio of countries with a standard deviation below 0.1 was more than 83.7%. This showed that for the vast majority of countries, the ratio between the export value of agricultural products and agricultural output value during 1986 and 2012 did not change greatly. Therefore, it was assumed that the ratio of the export value of agricultural products to the agricultural output value was given exogenously. [^Back]
. ① Because of the limited data, the control variables selected here are macro-level variables, and the level of economic development in a country is closely related to the factors of agricultural production and the rate of technological progress. Therefore, controlling macro variables also has certain rationality. [^Back]
. ① Generally, RCA= 1 is used as the critical value. When RCA ≥ 1, the comparative advantage is considered to be strong. When 0 ≤ RCA < 1, the comparative advantage is weak. In this paper, two standards of divisions are used, namely RCA= 0.5 and RCA= 1. The standard when RCA= 0.5 is weaker than the standard when RCA= 1, and more products are included in the calculation of the export diversity of agricultural products. [^Back]
. ① Item u1 is calculated according to Equation (16). Due to the difference in the standard of classification, when RCA ≥ 0.5, it is abbreviated as u1. [^Back]
. ② As shown in Table 2, the mean of u1 is 17.64. For convenience, it is taken as the integer 18. [^Back]
. ③ Item u2 is calculated according to Equation (16). Due to differences in the standard of classification, when RCA ≥ 1, it is abbreviated as u2. [^Back]
. ④ As shown in Table 2, the mean of u2 is 13.43. For convenience, it is taken as the integer 14. [^Back]
. ⑤ The classification of agricultural products refers to the FAO standard (see: http://faostat3.fao.org/mes/classifications/E). And 423 kinds of agricultural products are included in the FAO database. However, after the deletion of agricultural products with more missing values from 1986 to 2012, there are 394 kinds of agricultural products. FAO reclassified the agricultural products and categorized the products with similar properties into the same group. For example, some of the primary processed agricultural products are classified into one group according to a certain standard. Therefore, basically, it is not necessary to consider the increase in the kinds of agricultural products caused by the increase in the quantity of primary processed agricultural products in developed countries. [^Back]
. ⑥ FAO database: http: //www.fao.org/statistics/databases/en; World Bank database: http://data.worldbank.org.cn. [^Back]
. ① Both d1 and d2are above 100. [^Back]
. ② Both d1 and d2 are below 10. [^Back]
. ① The 37 kinds of agricultural products exported are barley wine, distilled alcoholic beverages, bran, palm kernel, cigarettes, roasted coffee, raw materials, myrtle and Japan wax, flour, food residue, dehydrated milk, distilled milk, fresh milk, nuts, palm oil, pastry, dry natural rubber, refined sugar, converted sugar, tea, sweets, fresh vegetables, vegetables to make vinegar, creamy concentrated whey, wheat, cocoa, coffee extract, coffee beans, raw tobacco, tomatoes, baby food, malt, beef, tobacco products, scallion, onions, palm kernel oil and products with stems peeled, dried, and grounded. [^Back]
. ① That is the 14th index, namely ucountryit in measurement of index in the fourth section. [^Back]
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