To prop up the NT dollar, the Central Bank of China sold US dollars and bought NT dollars. This caused a sharp rise in market interest rates, and in effect drew money out of the stock market to support the foreign exchange market.
央行為了力守新台幣匯率，拋美元、收台幣，造成市場利率飆漲，等於是把股市的資金抽去捍衛匯市。