本文針對市場中高低成本兩家廠商，透過選擇參與認證以提高消費者願付價格進行探討。若廠商在市場中進行數量競爭，我們發現當市場規模及商品異質程度足夠大，兩家廠商皆參與認證會產生最高的消費者剩餘，兩家廠商皆不參與認證對應的消費者剩餘最低。當市場規模增加，廠商進行認證的整體標準會上升；成本差額上升時，僅高成本廠商參與認證的標準範圍擴大，僅低成本廠商參與認證的標準範圍縮小，兩家皆參與認證以及兩家皆不參與認證的標準範圍縮小；最後，當市場競爭程度上升，且商品間具有一定異質性，廠商願意進行認證的整體標準下降。;This article given the market in the different cost of two manufacturers, the choice participates in the authentication enhancing the consumer be willing to pay a higher price. If the manufacturer carries on quantity competition in the market, we discovered when the market scale and the goods heterogeneity degree is high enough, two manufacturers all participate in the authentication being able to produce the highest consumer surplus, two manufacturers all do not participate in the authentication produce the lowest consumer surplus. When the market scale increases, the standard of manufacturer willing to participate in the authentication rises; When cost difference rise, the scope of only high-cost manufacturer participates in the authentication scope expands, the range of only low-cost manufacturer participates in the authentication will drop; Finally, when the market competition degree rises, the standard of manufacturer willing to carry on drops.
