What is traveler's checks

Professor, can you explain the questions 4 5 6 7 which you asked in email? I couldn't listen to classmates' answers very clearly in class. I think that some students have the same confusion. It is very nice if you can explain the questions and send us a email. Thank you very much!

What's the difference between Chinese banks and foreign banks?

老师，您在哪里@_@

Hi professor, I am very confused about this question.
I know that when Fed purchase $16000 from bank1, bank1's loans will increase$16000 and securities will decrease $16000. But I don't know why the reserve is 0... I think the bank need to have required reserve at least even if we don't know the RR.....

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I don't understand the question.

the assets are equal to liabilities and stockholders' equity, written in P890. but in T-accounts, the assets are equal to only liabilities. that means that the stockholders' equity is included in the liabilities?

Professor, in this chapter about M1, it says that, when inflation rates are very high, many households and firms do not want to hold their domestic currency because it is losing its value too rapidly. The value of the US dollar will be much more stable than their domestic currency.
What the differences between domestic currency and dollar? why the value of the dollar is more stable than their domestic currency?