economic question.....急..!!!!

答案應該係D

A唔岩
因為prediction係透過一個前因，推論出後果
例如見倒個天落雨，會predict個地下會濕
但係題目個statement冇話過因為乜野而推論出unemployment rate要低過7%

B唔岩
因為positive statement係客觀同valid既，係study "what is"既，係講事實
但係"unemployment rate要低過7%"唔係一個肯定既事實

C唔岩
因為assumption就係一個假設，用黎推論出prediction既
但係用呢個statement根本推唔出d乜

D係答案
因為normative statement就係一d主觀既statement，當中包含value judgment
係冇可能被推翻既，係study "what ought to be"
可以睇成係positive statement既相反
而"unemployment should be kept at or below a level of 6 percent"，
should be就係個key word，只係講呢個statement既人既value judgment