请问文字解析中的第二种方法如何理解？

01.单选题 已收藏 标记 纠错 Which of the following is most likely to cause the long-run aggregate supply curve to shift to the left? A Higher nominal wages. B A decline in productivity. C A increase in corporate taxes. 下一题 正确答案B 您的答案B本题平均正确率：82% Aggregate supply curve难度：一般 推荐：      答案解析 Productivity measures the efficiency of labor and is the amount of output produced by workers in a given period of time. A decline in productivity implies decreased efficiency. A decline in productivity increases labor costs, decreases profitability and results in lower output at each output price level——a leftward shift in both the short-run and long-run aggregate supply curves. 问：像这种AS曲线移动的题，有没有什么公式化的办法，还是只能凭借常识来想？

这个计算回款时间的公式不成立啊

为什么不选第一种还款方式

defeasance用赚到的钱抵消掉成本是什么意思

07.单选题 已收藏 标记 纠错 In the aggregate demand curve, which of the following is most likely to cause the curve to shift to the right? A Decrease in real estate values. B Increase in taxes. C Boom in the stock market. 查看解析 上一题 提交试卷 正确答案C 您的答案A本题平均正确率：85% Aggregate demand curve难度：一般 推荐：      答案解析 A boom in the stock market increases the value of financial assets and household wealth. An increase in household wealth increases consumer spending and shifts the aggregate demand curve to the right. 问：如截图，A选项 为什么 房地产降价 企业投资会下降？2.这类题 前边有一个用S=I+(G-T)+(X-M)的公式判定的讲解，挺清楚的，但是不适用于这道题，请问老师那个方法是通用的吗，还是这类题也要靠一定的常识判断？PS:麻烦按序号逐次回答 比较清晰呢 谢谢呐

02.单选题 已收藏 标记 纠错 The sensitivity of investment expenditure to interest rate is increase, what is the impact on the slope of the AD? A Steeper. B Remain the same. C Flatter. 查看解析 上一题 下一题 正确答案C 您的答案A本题平均正确率：45% Aggregate demand curve难度：一般 推荐：      答案解析 If interest rate is more sensitive to investment expenditure, the slope of AD will be flatter. The AD will be flatter if saving is insensitive to income, money demand is insensitive to interest rate and money demand is insensitive to income. 问：如果不当成结论记，能否给出简单推导，我自己试着推一下想？PS:1906基础课里貌似没有这三个小结论

既然CPR是年化的，为什么还有一个月的CPR、25个月的CPR?

请问老师，P/E，P/S增加,但是P/CF却下降是怎么回事，这种情况说明企业发生了什么

组合的数量越多，虽然组合方差的数量级小于协方差的个数，但是否就能说对整体方差的影响就小？