Why does CB buying own currency reverses expansionary policy?

In the case where the CB lowers interest rate, capital will flow out, leading to downward pressure on the exchange rate, and ultimately forcing the CB to buy the currency in the FX market.

Why does CB have to support the currency? Wouldn’t a lower exchange rate help with exports and stimulate the economy?

Why does supporting the exchange rate reverse the expansionary policy? wouldn’t domestic firms be able to borrow at a lower rate, and increase production.

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