Demand Elasticity for China's Major Imported Agriculture Textile Material Based on Restricted Version of Source Differentiated Almost Ideal Demand System Model

By comparing China's import of major imported agriculture textile material( cotton and wool),the characteristics of import are concluded. On this basis,a restricted version of source differentiated almost ideal demand system( RSDAIDS) is used to estimate the income and price elasticity of major imported agriculture textile material from the major sources based on the data from 1992 to 2015. The results are shown as follows.( 1) Although the dependency on imported cotton is lower than wool, the fluctuation of cotton import is much more drastic; China's demand for cotton is relatively price elastic with higher expenditure elasticity compared with wool; besides,the existence of complementarity is proved between imported cotton and wool.( 2) According to the import elasticity of cotton,demand for cotton imported from India shows priority over cotton from other sources; demand for cotton imported from America is the most price-sensitive one; substitution among cotton from different sources is weak.( 3) According to the import elasticity of wool,wool imported from Uruguay has bright market prospects. In addition,wool imported from Australia has irreplaceable advantage than that from New Zealand.     

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我国农业技术推广投资对农业经济增长的影响分析

农业技术推广是农业科技转化为现实生产力的重要纽带。从农业技术推广投资的结构和总量对农业技术推广现状进行分析,运用经济学市场均衡理论分析农业技术扩散效应过程,并通过协整分析法、误差修正模型、脉冲响应函数研究农业技术推广投资对农业经济增长的长期均衡关系与短期动态关系。研究表明,长期的农业技术推广投资战略对促进农业经济增长更为有效,并对此研究提出相应的对策建议。