需求量变动

阐述了经济分析中区分需求量变动与需求变动的重要性，并对教科书中吉芬商品和垄断竞争企业有两条需求曲线的有关分析提出了质疑。

This paper expounds the importance of the difference between a change in quantity demanded and a change ir demand when analyzing economy , and querys the validity of the statement " monopoly competitive firm is faced with two demand curves " and " Giffen good " in textbooks .

需求量变动还是需求变动

Change in Quantity Demanded or in Demand

对此，本文通过建立行业内部竞争模型分析行业内部需求量变动的因果关系，并进一步分析这种竞争关系对牛鞭效应的影响。

So we establish internal competition model to analyse the cause-result relation among the automobile industry .

同样，任何一种在每一价格时减少需求量的变动都会使需求曲线向左移动。

Alternatively , if buyers decrease the quantity demanded at each price , the demand curve shifts left which is called a decrease in demand .

这不仅会让人感到困惑，而且还会影响到对“需求量的变动”和“需求的变动”概念的理解。

It may not only be confusing , but also has some impact on the understanding of " shift of quantity demanded " and " shift of demand " .

出口退税率变动影响出口商品需求量，带动GDP变动，转变贸易增长方式。实行差别退税率优化产业结构和地区经济结构调整。

The fluctuation of the rate of the refunded tax on exports will influence the demands of exports , invite the change of GDP and transform the way of the increase of trade .

结果表明：1993年以后能源需求量的价格弹性增加，但是GDP增长和工资变动是影响90年代中期能源需求量变动的主要因素。

The result shows that the price elasticity of energy demand increases since 1993 , but the increases in GDP and in wage are the main factors which affect the change of the quantity of energy demand in the midst of 1990s .

需求价格弹性则是用来反映不同性质商品其需求量对于价格变动的敏感程度。

Elasticity is used for reflecting the sensitive degree to the change of the price of its demand of different nature goods at the demand price .