在雙佔廠商生產垂直差異產品的南北貿易模型中，我們分析平行輸入政策對廠商價格競爭的影響，並探討國家間平行輸入政策的互動關係。本文的分析得到：(1)當兩國消費者的產品品質偏好差異程度小時，北國政府一定會允許平行輸入，南國政府對於平行輸入的態度則是無關緊要，其市場均衡結果對於北國政府而言是最佳的結果。(2)當兩國消費者的產品品質偏好差異程度中等時，兩國政府必定採取同樣的平行輸入政策，兩國可能同時允許或禁止平行輸入，並且產生兩個市場均衡結果，其中北國偏好兩國同時允許平行輸入，而南國則是偏好兩國同時禁止平行輸入。(3)當兩國消費者的產品品質偏好差異程度大時，兩國政府同時採取禁止平行輸入的政策，其市場均衡結果對於南國政府而言是最佳的結果。

Based on the vertically differentiated duopoly in a North-South trade model we analyze the impact of parallel imports on price competition and the interaction of national parallel policies. We conclude that (1) when the difference between qualitative preferences of two countries is sufficiently small, the North will permit parallel imports and the South`s attitude toward parallel policy is irrelevant which leads to the North`s most preferred outcome. (2) when the difference between qualitative preferences of two countries is relatively intermediate, the North and the South will both permit or prohibit parallel imports. The former is preferred by the North and the latter is preferred by the South. (3) when the difference between qualitative preferences of two countries is sufficiently large, the North and the South will both prohibit parallel imports which is the South`s most preferred outcome.

目 錄
論文審定書………………………………………………………………………………i
謝辭……………………………………………………………………………………...ii
中文摘要………………………………………………………………………………..iii
英文摘要………………………………………………………………………………..iv
第一章 前言…………………………………………………………………………….1
第二章 基本模型………………………………………………………………….........6
第三章 市場競爭均衡………………………………………………………………….8
第四章 兩個國家都不實施平行輸入政策下的市場均衡…………………………...17
第五章 至少有一個國家實施平行輸入政策時的市場均衡………………………...21
第一節 北方國家實施平行輸入政策，南方國家不實施平行輸入政策……….21
第二節 北方國家不實施平行輸入政策，南方國家實施平行輸入政策……….25
第三節 北方國家實施平行輸入政策，南方國家實施平行輸入政策………….27
第六章 廠商研究與消費者剩餘……………………………………………………...31
第一節 廠商研究………………………………………………………………...31
第二節 消費者剩餘……………………………………………………………...32
第七章 社會福利極大化下的最適平行輸入政策…………………………………...38
第一節 當λ= 1…………………………………………………………………..38
第二節 當λ= 0…………………………………………………………………..43
第三節 當λ= 1/2………………………………………………………………..43
第八章 模型探討……………………………………………………………………...49
第九章 結論…………………………………………………………………………...50
參考文獻…………………………………………………………………….................53
附錄……………………………………………………………………….....................55

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