傳統討論市場競爭模型的架構中，企業僅生產單一產品，無法看出同一企業下產品間的交互做用。本文主採用Eckel and Neary(2010)對多產品廠商的設計架構，強化企業產品需求的連結，使得模型能夠看出個別廠商產量及產品種類在市場競爭下的消長情形，同時探討數量競爭和價格競爭下多產品廠商的策略行為，觀察與傳統單一產品模型之異同。除此之外，因我們尚未發現垂直相關市場的文獻將多產品廠商的架構納入討論，故我們亦簡單設置一個上游獨佔廠商進行垂直相關市場的研究，觀察下游多產品廠商在價格及數量競爭下，產量、產品種類數目及利潤上的消長情形。

In the traditional monopolistic competition model, firms only produce a single product and the varieties of product are responded by firm’s amount. In this framework, we cannot observe interaction between the firm’s product amounts and product scope.So,we based on Eckel and Neary (2010), which did study firm's market strategies and adhere the demand linkage between product amount and product scope. Then we can more clearly know how interact between product amounts and product scope. And we will compare their differences between price and quantity competition. Besides, we had not find the literature to insert the multi-product structure into related market. Therefore we setup a model which exists a upstream is a monopolist to observe how the upstream to affect the competition of multi-product firms in downstream.

目錄
論文審定書 i
摘要 ii
Abstract iii
目錄 iv
圖目錄 v
表目錄 vi
第一章 前言 1
第二章 模型設定 6
2.1 數量競爭 8
2.2 價格競爭 15
2.3 數值分析 21
第三章 垂直相關之市場競爭 23
3.1 數量競爭 24
3.2 價格競爭 27
3.3 數值分析 30
第四章 總結 32
參考文獻 33
附錄 35

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