透過一開放體系寡占模型的推導,本文首先建立一條以內銷市場產業集中度、進口集中度、進口比、本國廠商價格成本差異比與國內外廠商成本差異為解釋變數的進口價格匯率轉嫁彈性實證方程式。其次,依據1986-1992台灣中游石化業資料,利用迴歸方法對上述實證方程式進行估計,結果發現,進口自由化可能導致內銷市場產業集中度不再是進口價格匯率轉嫁彈性的重要影響因素;進口集中度與本國廠商價格成本差異比對進口價格匯率轉嫁彈性具有負面影響;進口比大於或等於0.43的產品之進口價格匯率轉嫁彈性會較大;國內外廠商成本差異比與進口價格匯率轉嫁彈性的關係剛開始為正,但很快就轉變為負。
Using the 1986-1992 data of Taiwan’s midstream petrochemical industries , and applying the OLS method to the empirical model derived from an oligopoly model in an open economy, this paper finds that domestic concentration is no longer an important determinant of the exchange rate pass- though elasticity after the 1986 trade liberalization; import concentration and domestic firms' PCM are significantly and negatively related to the elasticity of exchange rate pass-through; the midstream petrochemical industries whose import ratios are greater than or equal to 0.43 have higher elasticities of exchange rate pass-through than other industries. The cost differential between domestic and foreign firms affects the exchange rate pass-through elasticity positively at the very beginning, but negatively shortly after then.
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