當越來越多的零售商以價格促銷作為吸引消費者之手段時，市場上同時間內可能會有無數個同質或是不同質的商品在進行價格促銷，對產品製造商來說，在每天幾乎都會有不同的商品進行價格促銷下，是否應該隨競爭品牌起舞?亦或者具有優勢策略解呢？
本研究為了提供零售商與產品製造商有用之行銷決策資訊，將著重於分析價格促銷下之短期效果。藉由研究不對稱競爭(asymme-tric competition)、商品促銷彈性(promotion elasticity)與商品價格彈性(price elasticity)之關係等兩項議題，了解各類品間以及各品牌之競爭關係。而為了研究上述之議題，本研究選擇以連鎖便利商店(CVS)飲料項商品的實際銷售資料作為研究對象，建立多元迴歸模型分析，以實證研究的方式來探討這些相關議題。
經過多元迴歸模型分析後，本研究之結論為：在將市場上所有具有競爭性的替代品納入模型中考慮後，在同類商品中品牌間不對稱競爭之現象並不顯著，而在不同分類商品中之不對稱競爭現象，本研究之結論則是，當市場接受度最高之商品類別進行促銷會對市場接受度較低的商品類別之銷售量造成影響，但是市場接受度較低之商品類別進行促銷並不能對市場接受度較高之商品造成相同程度之影響。
在商品價格促銷效果與商品調整正常價格效果對於銷售量的影響之大小關係方面，本研究在觀察連鎖便利商店之商品價格促銷效果與商品調整正常價格效果時，發現兩者之間並無差異，參照前人之研究結論，認為消費者購買加速效果之不同，為造成在便利商店中商品價格促銷效果與商品調整正常價格效果無差異之主因，並推論消費者之購買加速效果或許為造成商品促銷彈性大於商品價格彈性之部分原因。

Promotion activities are frequently used to maintain competitive parity based on the belief that market share distribution among competing brands are influenced by advertising, features, price discounts, …etc. As the price promotion becomes one of the most important means to catch attentions of consumers, you may see both homogeneous products and substitution products promoted everyday. As a result, how manufacturers can identify their major competitors becomes an interesting and important issue for both manufacturers and retailers.
This research aims to provide useful analysis to help retailers and product manufacturers understand the competition relationship among all competing brands and products. The analysis emphasizes the short term effect of price promotion and study the issue of asymmetric competition, the relative strength between promotion elasticity and price elasticity. Furthermore, an empirical study based on the sales of beverage product in CVS is also analyzed in this research.
We found that the asymmetric competitions between homogeneous product categories are not significant when all competitively substitutable brands are considered. However, the analysis of the asymmetric competition between substitutable product categories does suggest that if the highly popular product categories are promoted, the sales volume of the less popular categories would be affected, while the opposite does not hold.
In addition to those mentioned above, this research finds that the promotion elasticity and price elasticity of beverage product are the same in CVS. This result reveals that this finding may be contributed by the lack of purchase acceleration effect.

目錄
致謝……………………………………………………………………….i
中文摘要…………………………………………………………………ii
英文摘要………………………………………………………………...iii
目錄……………………………………………………………………...iv
圖次……………………………………………………………………...vi
表次……………………………………………………………………..vii
第一章 緒論……………………………………………………………..1
1.1研究背景與動機………………………………………………...1
1.2研究目的………………………………………………………...3
1.3研究對象………………………………………………………...4
1.4論文架構……………………………………………………...…5
第二章 文獻探討………………………………………………………..6
2.1促銷效果………………………………………………………..7
2.2促銷效果之發生……………………………………………….10
2.3有關不對稱的交叉彈性……………………………………….12
2.4有關促銷彈性與價格彈性…………………………………….21
第三章 研究方法………………………………………………………26
3.1研究架構　…………………………………………………….26
3.2消費情境與品牌競爭情形…………………………………….27
3.2.1 本研究消費者之消費情境假定………………………...27
3.2.2 商品競爭空間描述……………………………………...29
3.2.3 價格促銷效果與調整正常售價效果之描述…………...29
3.3建立分析模式…………………………………………….……30
3.3.1 品牌轉換之不對稱競爭現象……………………….…..30
3.3.2 價格促銷效果與調整正常售價效果之關係…………...35
3.4多元迴歸模型建立………………………………………….…35
3.5資料收集與整理……………………………………………….38
3.5.1資料收集………………………………………………...38
3.5.2資料整理………………………………………………...41
第四章 研究結果……………………………………………………...44
4.1多元迴歸模式檢驗…………………………………………….44
4.2不對稱之競爭狀態分析描述………………………………….47
4.3價格促銷與調整正常售價效果之分析比較………………….53
第五章 結論與建議…………………………………………………...58
5.1本研究之結論……………………………………………………58
5.2給商品製造商之建議……………………………………………59
5.3研究限制…………………………………………………………59
5.4給後續研究者之建議……………………………………………60
參考文獻………………………………………………………………..61
附錄……………………………………………………………………..64

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