分析使得LM曲线在固定汇率情况下和IS曲线在弹性汇率情况下作内生变动的机制。这与是货币供给还是

汇率由经济内生决定的关系如何？ Analyze the mechanisms that make endogenous the LM cuFve in the case of fixed exchange ratesand the is curve in the case of flexible exchange rates．How does this．relate to whether the money supply or the exchange rate is endogenously determined in the economy？