A central bank s purchase of domestic currency and
corresponding sale of foreign assets in the foreign exchange market leads
to an equal decline in its international reserves and the monetary base.
We could have reached the same conclusion by a more direct route. A central
bank sale of a foreign asset is no different from an open market sale of a govern-
ment bond. We learned in our exploration of the money supply process that an
open market sale leads to an equal decline in the monetary base; therefore, a sale
of foreign assets also leads to an equal decline in the monetary base. By similar
reasoning, a central bank purchase of foreign assets paid for by selling domestic
currency, like an open market purchase, leads to an equal rise in the monetary
base. Thus we reach the following conclusion:
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