问题如下：
Lucy is a student learning Macroeconomics. She says, ‘The short run aggregate demand curve is upward sloping and the short run aggregate supply curve is downward sloping.” Is she correct?
选项：
A.She is only correct about short run aggregate demand curve.
B.She is only correct about short run aggregate supply curve.
C.She is wrong about both curves.
解释：
C is correct.
The short run aggregate demand curve is downward sloping because it shows the inverse relationship between the quantity of real output demanded and the price level. The short run aggregate supply curve is upward sloping because it reflects the positive relationship between output and the price level assuming wages and other input prices are not easy to change.
考点：AD以及AS曲线
解析：短期总供给曲线是一条向上倾斜的曲线代表的是总需求与价格水平之间的正向关系，而总需求曲线是一条向下倾斜的曲线，代表的是总需求与价格水平间的反向关系。所以C选项正确。
长期的需求曲线是什么样子
