To choose the point elasticity or the arc elasticity?
选择点弹性还是弧弹性？
First, we seek the origin of the elasticity and the invention of the point elasticity and the arc elasticity. We also search for their original paper respectively.
文中首先寻找弹性的由来始末，以及点弹性和弧弹性的产生过程，并各自找出它们的原始文献。
One way to evaluate this is by calculating the reduction in poverty for every percentage point increase in per capita income -- in economists' lingo, the income elasticity of poverty reduction.
通过计算人均收入每上升一个百分点贫困下降的多少，来评估是一个方法，这在经济学的术语中叫贫困减少的收入弹性。
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