Is monetary expansion policy the same as quantitative easing (i.e the buying of US treasuries by Federal reserve which injects more USD into the economy)?
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1$\begingroup$ Does this answer your question? What's the difference between Quantitative Easing and regular central bank operations? $\endgroup$ – Nai Jun 12 '20 at 5:06
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It is not. Monetary expansion is increasing the money supply (through whatever method).
Quantitative easing increases the money supply / injects liquidity, but also reduces privately hold stocks (and hence can reduce risks from the banks' balance sheets).