二、三等◆經濟學(研究)題庫下載題庫

Mundell–Fleming model has been used to argue that an economy cannot simultaneously maintain a fixed exchange rate, free capital movement, and an independent monetary policy. This principle is frequently called the "impossible trinity," "unholy trinity," "irreconcilable trinity," "inconsistent trinity" or the "Mundell–Fleming trilemma."

固定 貨幣政策無效 你LM右 之後又要左移回來
貨幣政策沒有自主性  怎麼可能會有效
固定匯率是財政政策才有效

浮動 貨幣政策都有效  貨政策自主性超高