没有明白折现率是什么意思？这个公式也不懂，这个公式中的CF是什么意思呢？

02.单选题 已收藏 标记 纠错 Equality between aggregate expenditure and aggregate output implies that the government‘s fiscal deficit must equal: A Private saving - Investment - Net exports. B Private saving - Investment + Net exports. C Investment - Private saving + Net exports. 查看解析 上一题 下一题 正确答案A 您的答案A本题平均正确率：51% GDP calculation难度：一般 推荐：      答案解析 The fundamental relationship among saving, investment, the fiscal balance, and the trade balance is S = I (G - T) (X - M). This form of the relationship shows that private saving must fund investment expenditures, the government fiscal balance, and net exports (= net capital outflows). Rearranging gives G - T = (S -I) - (X - M). The government's fiscal deficit (G - I) must be equal to the private sector's saving/investment balance (S -I) minus net exports. 问：如图，紫色箭头标明的 1.aggregate output就是总收入 output为啥对应income？2.fiscal deficit是 G-T,G-T应该是盈余或者赤子吧，感觉表达的也不严谨？

你好麻烦讲解一下21题

01.单选题 已收藏 标记 纠错 In 2013, a calligraphyis produced and sold for $3,000. The expenses involved in producing the painting amounted to $1,000. What is the value added by the final step of creating the painting based on the sum-of-value-added method of calculating GDP: A $2000. B $3000. C $5000. 查看解析 下一题 正确答案A 您的答案A本题平均正确率：77% GDP calculation难度：一般 推荐：      答案解析 This is the value added by the artist: $3,000 — $1,000 = $2,000. 问：这个是基础课里的截图：她的意思是 第一个0.15也要算进来，对应这道题就是第一个1000块钱也应该算进来吗？ 是否有矛盾？

这道题算出PA乘以PB不等于八分之三 是不独立事件 答案不应该选B吗 怎么是A

老师这道题 算出PA乘以PB不等于八分之三 所以他们两个是不独立事件不应该选B吗

问：紫色框框内的CCA 说的是 当一个东西用久了 我要追加投资，但是和“收入”有什么关系呢？为什么算在 收入法中？

请问为什么+1

老师这几个formula在哪儿呀？视频里并没有说呀？？

麻烦解释一下第二题ABC选项和第五题