老师，衍生reading46原版书课后题39题能不能说一下

老师，41题能不能把视频说的第一种方法讲一下，视频讲的有点跳步骤，没有很深刻理解

MBS是住房贷款抵押证券？还是住房贷款抵押债券？证券和债券可不一样。

这里是预付账款，代表钱给了，没收到货，但如果已经收到货了，那货物不就是计入在ASSET里吗，预付费用和收到的货物等价，预付费用消除，那存货增加，ASSET不就是不变，啊

security deposit,是给房产公司的保证金是吧，security deposit为什么属于自己公司的ASSET，是因为保障金在后期还要换回来，就等于什么也没变，就等于资产吗

这道题算DEPS时，+49000是为什么？

为什么财务状况较差就是杠杠高。NI为负，不说明公司财务状况更差吗？

The category of persons who would be most likely to be harmed by an increase in the rate of inflation is: A homeowners with fixed 30-year mortgages. B retirees relying on a fixed annuity payment. C workers employed under contracts with escalator clauses. B我觉得说得有道理，但A的话，参考美国现在因为通胀加息，之后带来的利率提高，对于有房贷的人来说不也是更大的harm吗？

Which of the following is most likely to increase after an increase in aggregate real personal income? A Equity prices B Building permits for new private housing units C The ratio of consumer installment debt to income 收入上升，C的ratioD/I 不应该变小吗？B可以理解为收入增加，大家买房子的需求上升，所以buildingpermit上升？

The inventory–sales ratio is most likely to be rising: A as a contraction unfolds. B partially into a recovery. C near the top of an economic cycle. contraction的时候sales减少inventory增加，inventory-salesratio 上升，所以感觉应该是A？