To my understanding when say China buys US bonds, it uses its USD reserves to make the transaction. So they first need USD from trade to buy the bonds. Chinese company will sell goods for USD, Chinese will then convert USD for Yuan. Central bank normally prints new Yuan to keep currency low and hold USD as reserves or use those USD to buy bonds.What about when it monetizes debt ie buys Treasury bonds (including from foreign countries) and mortgage-backed securities and lends this credit to other banks?
But yes, there are other ways to get USD out to the world, debt/foreign investment is one of them. Though it leaves you more vulnerable.
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