tranquilium
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The simple answer: when interest rates rise, there are new bonds in the market paying that higher interest rate (bonds are issued all the time). So the new bonds are more desirable, and the existing bonds less desirable. The existing bonds must therefore trade at a discount to the new bonds to attract buyers.
Slightly less simple answer: it's a mathematical function, as bond prices depend on the prevailing discount rate (the interest rate). Price = (C/(1+i)) + (C/(1+i)^2) + (C/(1+i)^3) + ....+ (C/(1+i)^n) + (M/(1+i)^n)
C = coupon payment
n = number of payments
i = interest rate or required yield
M = value at maturity (or par value)
When C, n, and M are held constant and i increases, the price falls.
Ah, if you are referring to the bonds, then I need to mention that less than 1/3 of the foreign debt hold by China is in the form of US bonds, also quite a bit of the bond was bought prior to 2006 where the flat rate was once as high as 3.4%.
Also, it really isn't "losing money", more like it isn't making as much money as it could have.
The reason I went to capital flow first is that capital outflow, especially large amount of it, is the one that can actually harm the economy.
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