本論文分為三個主題,分別探討外國貿易對台灣中游石化業績效,開放程度與匯率轉嫁之影響（此欄無法空白,故填入簡單說明） / The dissertation is a collection of three separate but related papers which are devoted to the empirical studies of Taiwan’s midstream petrochemical industry. In addition to the introductory chapter, three papers are presented respectively in chapters 2 through 4. The empirical results in chapter 2 confirm the causalities derived from the theoretical model, and demonstrate that there do exist simultaneous relationships among domestic firms’ PCM, domestic concentration, import and export shares in Taiwan’s midstream petrochemical industries. Specifically, domestic concentration affects domestic firms’ PCM positively while import share, export share, import concentration and country concentration of exports affect domestic firms’ PCM negatively. Domestic firms’ PCM, import share and import concentration affect domestic concentration positively while market size affects domestic concentration negatively. Domestic concentration and cost differential affect import share positively while domestic firms’ PCM, export share, import concentration and capacity utilization affect import share negatively. Domestic firms’ PCM, import share and import concentration affect export share negatively. In addition, the results also imply domestic firms seem to be in a situation of collusion during the period of 1989-1997, and the collusive behavior probably has originated from their subsidiary or old employer-employee relationship. In chapter 3, the regression results confirm the causalities derived from the theoretical model, and demonstrate that there do exist simultaneous relationships among domestic firms’ PCM, domestic concentration and the openness to trade in Taiwan’s midstream petrochemical industries. Specifically, domestic concentration affects domestic firms’ PCM positively while openness and import concentration affect domestic firms’ PCM negatively. Domestic firms’ PCM, openness, import share, import concentration and capacity utilization affect domestic concentration positively while market size affects domestic concentration negatively. Domestic concentration and import share affect openness positively while domestic firms’ PCM and import concentration affect openness negatively. Based on the derived causalities, the above empirical results imply that the interactive relationship among domestic firms as well as that between domestic and foreign firms might both be collusive during the period of 1989-1997, and the collusive behavior probably has originated from their subsidiary or old employer-employee relationship. In chapter 4, we have found that firms from the two largest importing nations of midstream petrochemicals in Taiwan, the US and Japan, have exercised market power in Taiwan market during our sample period. However, our data seems to suggest that other causes of incomplete pass-through were important for Japan and US imports. Observing the differences between Japanese and the US import behavior, cost increases for Japanese firms have a lower effect than US firms on equilibrium price, that could be explained by the desire of Japanese manufacturing firms to build up their shares in Taiwan during the period. In addition, the result indicates that the Japanese firms in Taiwan have more market power than US firms. According to theory model, this result also implies that elasticity of exchange rate pass-through of Japanese firms is smaller than the US firms’.

在匯率轉嫁的議題上，台灣實證大都利用加總資料(aggregated data)來做分析與研究。國外文獻發現，將產業細分後加以研究的結果，與使用加總資料之結果似乎有些出入。故本文將利用進口之鋼鐵、汽車、成衣、原油等產業細分資料，並採用共整合分析來尋找長期轉嫁關係。其結果發現：1.利用季資料頻率來做分析較為適合。2.長期匯率為不完全轉嫁，且轉嫁程度並不高。3.在不對稱轉嫁的研究結果顯示，長期不對稱轉嫁之現象並不明顯，惟鋼鐵產業據統計顯著性，表示其有不對稱性，但不對稱性之差異並不大。 / In the past, most people used aggregated data to analyze Taiwan exchange rate pass-through. In this paper, we analyze Taiwan exchange rate pass-through into import price by subdividing industry data and use cointegrating test to estimate their relation in long run. We find out some difference from past documents of empirical analyses of Taiwan. First, using seasonal data is more suitable than using monthly data to analyze this issue. Second, exchange rate pass-through is uncompleted in the long run. And the magnitude of pass-through is far away from 1(completed pass-through). Third, in the long run, there is no asymmetry of exchange rate pass-through.

當匯率的變動沒有完全反映在出口價格上時，即產生匯率不完全轉嫁的效果。本文以台灣中游石化業的13種產品作為研究對象，資料期間為民國78年1月至民國91年12月，並且在考慮中游石化業的特性下，採用成本加成定價法模型，來探討匯率波動時對出口價格的影響。 實證上，我們為考慮資料定態性的問題，乃採用ADF單根檢定、共整合分析與誤差修正模型。此外，我們利用衝擊反應函數與預測誤差變異數分解，來了解各變數對出口價格的影響。實證結果發現：各產品間的出口匯率轉嫁不盡相同；當受外在衝擊後調整恢復至長期均衡關係的調整速度也不同；各產品的出口價格受其他變數的影響亦有所不同。

近年來，由於國際化的開展，國際貿易愈來愈普及，匯率因此扮演一個重要的角色。貶值固然可以提高一國的出口競爭力，卻可能造成通貨膨脹而不利本國消費，激烈的匯率波動更會造成兩國間貿易的不確定性。因此，各國中央銀行為了穩定外匯市場及商品市場，並為了追求低而穩定的通貨膨脹率而干預匯率波動。依據Devereux and Engle (2003)，跨國廠商在訂貿易財價格時可採生產者貨幣訂價法（producer-currency pricing, PCP）或當地貨幣訂價法（local-currency pricing, LCP），在此兩種訂價方式下，匯率的轉嫁程度會有所不同，此亦可能會改變貨幣政策的總體經濟效果。 本文在一小型開放的動態隨機一般均衡模型（DSGE）下，加入央行的資產負債表與貨幣政策法則，探討當外生衝擊發生時，在不同的匯率轉嫁程度下，央行採取彈性匯率或管理浮動匯率對總體經濟變數產生的影響。 / With the development of the global economy, the international trade has become more common. When the country trades with other countries, exchange rate plays an important role. The currency depreciation may generate the current account surplus, but may lead to higher inflation and hurt the domestic consumption. Drastic exchange rate fluctuations may result in the uncertainty in trades. As the result, central banks may intervene in the foreign exchange market to stabilize exchange rate movements. Devereux and Engle (2003) build up the two-country DSGE model to examine macroeconomic effects of monetary policy under different degree of exchange rate pass-through. They consider two cases: producer-currency-pricing (PCP) where the exchange rate pass-through is complete and expenditure-switching effect exists, and local-currency-pricing (LCP) where the exchange rate pass-through is incomplete and there is no expenditure-switching effect. In the paper, we follow the small-open-economy DSGE model in Kollmann (2002) by including the balance sheet and alternative monetary policy rules of the monetary policy to examine the different macroeconomic effects under different degrees of exchange rate pass-through.

台灣的經濟發展，仰賴對外貿易甚鉅。廠商如何因應匯率的變動，在國際競爭激烈的貿易市場中策略性的定價以取得優勢，一直是國際貿易與金融發展上重要的議題。因此，本論文包括三篇文章，依序透過台灣進口物價、出口物價，以及人造纖維梭織布的出口價格，探討匯率轉嫁與市場取價的相關議題。以下就每篇文章的重點摘要如下。 第一篇主要驗證「菜單成本」(menu costs) 存在，所產生之不對稱匯率轉嫁行為。由於菜單成本的存在，出口商必須在調價所產生的菜單成本，以及不調價對其市場競爭力的減損中，進行權衡取捨(trade-off)。我們首先透過模型推導，說明在此情況下，出口商唯有在匯率變動超過某一水準（門檻）時， 才會因應匯率變動進行調價。這意謂若匯率波動幅度較小時，出口商囿於菜單成本不會調整價格，進口國將面臨完全匯率轉嫁；而若匯率變動幅度夠大，出口商才會調整價格以維持其市場競爭力，而產生不完全匯率轉嫁。為驗證並說明此一不對稱匯率轉嫁現象，我們利用門檻迴歸模型(threshold regression model)進行台灣進口品是否有不對稱轉嫁之實證分析。結果顯示，以匯率變動幅度為門檻變數下，當匯率變動幅度小於門檻值3%時，匯率轉嫁程度高達58.7%;而匯率變動幅度高於門檻值3%時，則無顯著之匯率轉嫁。 我們因此認為菜單成本的存在，確實可能導致匯率不對稱轉嫁行為。 第二篇則應用門檻迴歸模型檢驗台灣出口物價是否因菜單成本導致在匯率變動幅度不同時，產生不同程度調整加成的出口定價行為，導致不對稱匯率轉嫁。 實證結果顯示，當匯率變動幅度低於門檻2.5%時，調整出口價格的幅度為27%。反之，當匯率變動幅度超過門檻值時，相較於前者，調價幅度增加至42%。經檢定兩者有顯著差異，證實有不對稱匯率轉嫁。上述不對稱匯率轉嫁的實證結果與理論預期並未完全相符。我們認為可能的原因在於出口商考量當期市佔率對未來利潤的潛在影響力，因此即使當期匯率變動幅度小，仍選擇微幅調價，藉以維持市場優勢與價格競爭力。亦即菜單成本可能並非影響其定價行為的關鍵因素。此外，廠商也有可能考量其在短期無法立即因應需求而擴張產能，因此即使匯率變動幅度小，仍選擇調價穩定進口價格，如此可避免因產能不足無法接單而流失客戶。再者，受限於資料的取得，我們採用總體出口物價資料，因此僅能呈現出平均的定價行為，而無法凸顯個別產業的出口定價行為。上述皆有可能是造成理論預期與實證結果不完全一致的原因。 為修正前兩篇使用總體資料的缺點，並進一步瞭解出口商因應匯率變動時是否依不同目標市場決定不同的調整加成幅度，在第三篇中本文使用人造纖維梭織布產業資料，主要探討在不完全競爭市場的結構下，出口商面對匯率變動時的「市場取價」行為。由於紡織業為台灣創匯產業，早期以出口胚布和成衣服飾品為主。到1980年代以後，逐漸地轉為以出口紗與成品布為主。在2005年全面取消全球紡織品配額後，紡織業的競爭更加激烈。儘管台灣有許多紡織廠外移至大陸及東南亞國家生產，使得台灣布料的出口額逐年減少。然而，台灣的人造纖維梭織布的出口單價卻有上升的趨勢。因此，本文主要探討台灣自1999年至2009年，人造纖維梭織布出口至美國、中國、香港及印尼等前四大出口目的國，因應匯率變動的出口定價行為是否具有市場取價的特性。此研究有助於我們瞭解產業競爭的過程與廠商的定價行為。實證結果顯示，台灣人纖梭織布的出口有市場取價的能力。對於出口至美國及香港的人纖梭織布，出口商會因應匯率等比例調整加成，自行吸收匯率變動對進口價格的影響，以穩定進口價格(即 local currency pricing stability)。對於出口至中國及印尼的人纖梭織布，則未有明顯的證據支持類似的調價行為。

本論文探討不同的物價環境對匯率轉嫁程度的影響。有別於既有文獻將通貨緊縮納入低通膨的區間一併討論，本論文特別區分通貨緊縮與低且正的通膨區間，估計不同物價環境下的匯率轉嫁效果。 利用門檻迴歸模型（threshold model）及台灣1981-2008年的資料，且區分能源價格及非能源價格，本文的實證結果顯示，通貨緊縮考慮與否將影響匯率轉嫁程度與通膨、通縮環境的關係。不同於既有文獻發現匯率轉嫁效果與通膨環境呈正相關，本文發現通貨緊縮環境下的匯率轉嫁效果會提高。此外，包含能源價格之匯率轉嫁效果隨物價環境變化的幅度較大，與既有文獻的看法一致。 因此，在匯率轉嫁效果與物價環境的分析上，明確區分通貨緊縮的情況有其必要性，否則可能形成偏誤之推論。 / This dissertation incorporates inflation and deflation in the analysis of exchange rate pass-through at different price levels. Because the existing literature generally consider deflation as part of low inflation, pass-through estimates tend to be considered the same for these two regimes. This study separates the effects of deflation and low positive inflation and estimates the pass-through for different price levels. This dissertation uses a nonlinear model with aggregate and disaggregate import prices data from 1981–2008 in Taiwan to first examine the pass-through for two regimes of high inflation and low inflation. The results confirm the notion in the literature that a positive relationship exists between pass-through and inflation. Then, this dissertation extends the model to a three-regime setting, including high inflation, low positive inflation, and deflation. When deflation is clearly defined in a three-regime model, the degree of exchange rate pass-through is found to be increasing in both high inflation and deflation. The positive relationship at all price levels is no longer valid while the effect of deflation is separated from that of low inflation. In Taiwan, the pass-through becomes inversely greater as the inflation rate falls into a deflationary regime. That the pass-through is higher in a deflationary regime became particularly obvious after the 1997 financial crisis. Contrary to the results predicted by the positive relationship, this analysis does not find an unlimited downward trend for the pass-through. A rebound occurs in the degree of pass-through once deflation is clearly identified, and this pattern is also found for half of the importing industries categorized using the Standard International Trade Classification (SITC). In addition, the results are consistent with the notion that oil prices usually fluctuate much more than the prices of other imports. The estimates show that the pass-through changes the most for fuels and related materials. Obviously, fluctuations in the price of oil influence the measurement of the pass-through. The increase in the pass-through found in a deflationary regime becomes smaller when oil prices are excluded.

過去實證研究顯示，匯率轉嫁程度並非一成不變，而是具有隨時間變動的特性。因此，有別於過去文獻大多採用滾動相關係數，本文則是使用Engle(2002)提出的動態條件相關係數模型，估計台灣於1982年至2014年間匯率變動與進口價格變動間的動態條件相關係數；並以其做為匯率轉嫁的代理變數，進而探討台灣匯率轉嫁的時間變動趨勢。我們的實證結果顯示，不論是用滾動相關係數還是動態條件相關係數，台灣的匯率轉嫁都明顯具有隨時間變動的特性。雖然5年期與10年期的滾動相關係數均在1997年前後分別呈現上升與下降的趨勢，動態條件相關係數則無類似的現象。然而，由於滾動相關係數容易受到滾動視窗樣本大小或滾動視窗有無包含極端值的影響，使得此方法較無法看出匯率轉嫁變動的準確時間點，而動態條件相關係數模型則可避免此問題。此外，本文實證發現，通膨環境與匯率波動是造成台灣匯率轉嫁隨時間變動的主要因子，對匯率轉嫁皆有顯著的正向影響。在排除1986年匯率轉嫁與進口滲透率呈現短暫負向關係的資料後，進口滲透率與匯率轉嫁的正向關係變為顯著，而進口滲透率也成為影響匯率轉嫁的原因之一。 / According to past empirical studies, it is believed that exchange rate pass -through (ERPT) has the time-varying nature. In this paper, we apply the Dynamic Conditional Correlation (DCC) model of Engle (2002), rather than the rolling correlation coefficient prevalently used by other studies, to analyze the time trend of ERPT for Taiwan. We estimate the dynamic condition correlation between the changes of exchange rate and the changes of import price using monthly data from 1982 to 2014 and use this correlation as a proxy for the degree of ERPT. Our empirical results show that ERPT for Taiwan, whether measured by the DCC or the rolling correlation coefficient, has a significant time- varying nature. In addition, both 5-year and 10-year window rolling correlation coefficient increase before 1997 and decline after 1997, which does not show in the DCC. However, the rolling correlation coefficient does not provide precise timings in the changes in ERPT, because of the dependence on the size of windows and whether or not outliers exist in the window. In contrast, the DCC does not have this kind of problem. Another important empirical result of this paper is that the inflation environment and the exchange rate volatility are main factors which explain the time-varying ERPT, and both of them have positive relation with ERPT. Moreover, the import penetration becomes positively significant after excluding data which shows temporary negative impact of the import penetration on ERPT in 1986.

開放經濟中，匯率可以透過競爭效果及進口型的通貨膨脹抬升價格，或藉由資產負債效果造成通貨緊縮。本文依循 Carranza et al. (2009) 的實證模型，控制美元化程度的影響，並使用Lin (2010) 的動態分量迴歸方法，針對1974Q1-2010Q4期間80個國家，檢驗不同通貨膨脹水準下的匯率轉嫁效果。總體而言，通膨愈高的時候，匯率貶值的擴張效果愈強；但當通膨降低，其強度也隨之減弱。此結果在考慮其他解釋變數或不同貶值情形後仍維持穩健。而當進一步檢視不同國家或期間的匯率轉嫁效果，匯率對通貨膨脹的正向效果，在中低所得國家中普遍較強，但在1995年後減弱，甚至轉為負向。Taylor（2000）的假說，得以在本文大部分的實證結果中證實。 / In an open economy, exchange rate could either increase prices by competitiveness effect and imported inflation, or be disinflationary through the balance-sheet effect. Controlling for the impact induced by the degree of dollarization, I follow the empirical model of Carranza et al. (2009) with a wide panel of 80 countries over 1974Q1-2010Q4. The exchange rate pass-through is investigated at various inflation levels in a dynamic panel quantile analysis suggested by Lin (2010). In general, exchange rate depreciation is more inflationary the higher inflation levels, but the magnitude of pass-through is reduced as inflation become lower. Also, the results are robust with respect to add other explanatory variables or take the depreciation cases into account. Furthermore, to investigate the pass-through across countries or periods, the positive impact of exchange rate on inflation is greater in middle- and low-income countries, but declines and even becomes negative after 1995. The hypothesis in Taylor (2000) is thus confirmed in most part of our empirical results.