旗形和三角有啥区别？

老师，COGS在哪张表上，是时段数

老师，麻烦解答下课后题这里的第9，10题

8 Emerging markets have benefited from recent trends in international markets Which of the following has not been a benefit of these trendsA Emerging market companies do not have to worry about a lack of liquidity in their home equity markets.B Emerging market companies have found it easier to raise capital in the markets of developed countries.C Emerging market companies have benefited from the stability of foreign exchange markets.老师，这一题不选C的原因是什么？C选项说发展中国家受益于foreign exchange markets的稳定性，这里foreign exchange markets是指发展中国家自己的货币稳定性还是外国（发达国家）的货币稳定性？

想问下10笔deposit最后一笔不应该是在第9年收到嘛？为什么20年分的两段不是n=9和n=11？

麻烦老师讲解一下bull flat,bull steepen, bear flat, bear steep 情境下yield curve strategy

老师这段我晕了

麻烦老师解答一下红框，上课没提到

这题不用计算器算不出来吧。

老师说回归模型中的贝塔也是权重，但是这里贝塔1是0.99,贝塔3是0.15,贝塔4是0.25，权重之和远远超过1,怎么理解？