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品質差異的雙占廠商之市場優勢分析

The Market Dominance in a Vertically Differentiated Duopoly

摘要


在各類產品市場上,如汽車產業或食品產業,我們可以發現一個共同的特徵,那就是生產高品質產品的廠商不一定擁有較高的市場份額及利潤。然而,在垂直產品差異性的相關文獻中,大部分的研究結果卻都得到了「高品質廠商具有高市場份額及高利潤」的結論。為了探討此一現實與理論的不一致性,本文建立一個結合垂直產品差異性及基本效用的一般化模型,並藉此在數量競爭下探討廠商的品質選擇及市場的均衡結果。本文的研究結果發現,由於基本效用的存在,低品質廠商可能具有「高市場份額及高利潤的市場優勢」,此結果與大部分垂直產品差異性文獻的結論不同。再者,我們也發現隨著基本效用越大時,兩家廠商的均衡品質將會越小。

並列摘要


In many markets, like automobile and food industries, a common feature is that, the high-quality firms usually do not have neither a larger market share nor a higher profit. In most models of vertical product differentiation, however, it is well known that the high-quality firm always dominates both in terms of profit and market share theoretically. Accordingly, this paper proposes a general model combining baseline benefit settings to discuss whether the high-quality firm dominates in terms of profit and/or market share in detail under Cournot competition. We found that the low-quality firm acquires dominance in market share and profit when the baseline benefit is high enough. Besides, an increase in baseline benefit lowers Firm's quality.

參考文獻


Aoki, R.,Prusa, T.(1996).Sequential versus Simultaneous Choice with Endogenous Quality.International Journal of Industrial Organization.15,103-121.
Baake, P.,Boom, A.(2001).Vertical Product Differentiation, Network Externalities, and Compatibility Decisions.International Journal of Industrial Organization.19,267-284.
Boccard, N.,Wauthy, X.(2006).Quality Choice, Sales Restriction and the Mode of Competition.The Manchester School.74,64-84.
Choi, C.,Shin, H.(1992).A Comment on a Model of Vertical Product Differentiation.Journal of Industrial Economics.40,229-231.
Colombo, L.,Lambertini, L.(2003).Dynamic Advertising under Vertical Product Differentiation.Journal of Optimization Theory and Applications.119,261-280.

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