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政策跨時搭配、政策不確定與匯率的動態調整-雙元匯率制度下的分析

Intertemporal Policy Mix, the Policy Uncertaintyand Exchange Rate Dynamics-The Analysis under Dual Exchange Rate Regime with Neutral Intervention Operations

摘要


本文以Liaw(2000)中立干預操作雙元匯率制度的「確定性政策」模型爲基礎,予以延伸至不確定的情況下,來從事當經濟體系面臨財政政策當局「單一政策宣告」與「政策跨時搭配」時的政策效果分析,結果得到: 1.當經濟體系面臨財政當局「財政政策政策劑量宣告不確定的跨時政策搭配」時,到底金融匯率會呈現調整不及、調整過度抑或錯向調整反應的關鍵決定因素中,「資本移動性的相對大小」、「貨幣政策與財政政策之政策劑量效果的相對大小」與「貨幣政策及財政政策之宣示效果的相對大小」這三項因素扮演了舉足輕重的角色,其中「貨幣政策及財政政策之政策劑量效果的相對大小」這項因素則是則是Liaw (2000)「確定性政策」模型所未考慮到的重要決定因子。 2.當經濟體系面臨財政政策當局「單一政策宣告」或「政策跨時搭配」的不確定性時,則在政策宣告迄政策執行前,經濟變數的預期調整路徑即是實際的調整路徑;到了財政當局真正亮出政策執行劑量的底牌時,若所執行的政策劑量正如民眾事先所預期,則經濟變數的預期調整路徑也仍是實際的調整路徑;但若財政當局真正所執行的政策劑量與民眾事先所預期的並不一致時,民眾就會立即修正預期,使經濟體系水平跳動到另一實際的馬鞍收斂路徑上,再沿著該一收斂的馬鞍路徑走向長期均衡點。因此,財政當局在政策執行時,若財政當局真正所執行的政策劑量與民眾事先所預期的並不一致,則金融匯率除了在政策宣告的時刻會跳動之外;另外,在政策執行的時刻也會產生跳動的反應。

並列摘要


This paper extends the theoretical framework of Liaw's (2000) 「policy certainty」 model into the fiscal policy uncertainty situation. In a dual exchange rate regime with neutral intervention operations, this paper studies the effects of intertemporal policy mix on dynamic paths of financial exchange rates under the fiscal policy uncertainty. The major findings are (1) the key factors of financial exchange rates will be characterized by misadjustment, undershooting or overshooting are 「the relative magnitude of capital mobility」、「the relative magnitude of policy increment effect under fiscal and monetary policy」 and 「the relative magnitude of policy announcement effect under fiscal and monetary」, among the upper determinants, 「the relative magnitude of policy increment effect under fiscal and monetary policy」 is the key factor which Liaw's (2000) 「policy certainty」 model doesn't take into account (2) if the policy increment of the authority actual executes and ex ante anticipation of the public are inconsistent, then on the instants of policy announced and actual executed, the financial exchange rates will be jumped.

參考文獻


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