主产区玉米生产全要素生产率提高主要是由于技术进步速度大于技术效率下降的速度。
Result shows that corn production in main producing areas is mainly scale inefficiency and is at the stage of decreasing returns to scale.
从长期的角度来看，经济增长的主要原因则是要素供给的增加和全要素生产率的提高。这些因素都与进口和利用外资有着密切的关系。
In a long run, the main causes for economic growth are the increased supply of factor endowment and the improvement of TFP (Total fact Productivity), which are connected with import closely.
根据实证研究表明：影响经济增长的关键因素是提高全要素生产率(tfp)。
Many researches indicate the key factor of economic growth is the development of TFP.
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