L'objectif de cette thèse est double. Premièrement, elle vise à proposer une revue de la littérature économique s'intéressant à l'exposition au taux de change de la profitabilité des entreprises non-financières, et à fournir de nouveaux enseignements sur son hétérogénéité intra et inter-sectorielle. Deuxièmement, cette thèse analyse les stratégies de production et de produits mises en œuvre par les firmes pour se prémunir des effets de ces variations de change. Puisque l'éventail de telles stratégies est large, le dernier chapitre se concentre sur la stratégie de montée en gamme. / This thesis follows a dual objective. First, it aims to summarize previous evidence on the magnitude and channels underpinning a non-financial firm’s operating exposure, i.e. the extent to which currency fluctuations can alter a company's future operating cash flow, and to provide new highlights on the heterogeneity of this exposure across firms. Second, this thesis investigates the product and production strategies that are appropriate for coping with the economic consequences of exchange rate changes on firms’ operating profits. Since the range of these strategies is large, it focuses on providing theoretical and empirical evidence for the strategy of up-market positioning.

本篇論文從不同公司策略，以月資料來探討台灣532家上市公司在1999~2004年之公司對匯率風險曝露的敏感度，並以六十個月各上市公司股價報酬率為依變數，與台灣最大十五個貿易夥伴的匯率資料為自變數橫斷面資料，進行匯率風險對股價報酬關係之檢定。與之前實證研究不同之處是，本研究是利用多種貨幣模型來解釋各股價報酬，非只有一個貨幣當作唯一的指標。實證結果發現尚未加進大盤指數為控制變數時，只有0.93%受匯率風險暴露，反之，加進大盤指數之後，受到匯率風險的公司增加到88.2%。以公司策略及產業角度來看，結果顯示當公司外銷比例越大，此公司承受的經濟風險會越高。 / The purpose of this empirical study is to investigate sensitivity of company values to fluctuation in foreign exchange rates. Distinguishing from the previous research, this study employs a multiple currency proxy model to estimate firm’s exposures instead of using a single currency model. The research sample includes all Taiwan listed firms’ data for the period from 1999 to 2004. The empirical evidence from Taiwan listed firms indicates that 85.3 to 88.2 percent of firms are exposed to foreign exchange rate movements when market return control variable is included in the regression. A small percentage of firms are exposed to the foreign exchange rate movements with exclusion of the control variable. Results from ordinary least square analyses reveal that export intensity increases economic exposure to fluctuation of foreign exchange rate.