雖然買貴退差價的保證(price-matching guarantees)是生活中常見的策略，也是廠商常用來吸引消費者的促銷方案之一，但在相關文獻中，有關消費者購買商品過後的行為表現之研究容易被忽略。
本研究的兩個實驗以購後行為為基礎，討論由消費疼痛感(pain of paying)所驅使的個人差異之影響。實驗一證實，在買貴退差價的保證下，小氣鬼(tightwads)的購後搜尋意願會高於奢侈鬼(spendthrifts)，且我們更進一步發現，兩類型消費者的購後搜尋意願僅在其所購買的商品為高價格水準時才有顯著差異。與差別取價(price discrimination)的概念一致地，實驗二證實，消費者在有此策略的店家消費且又發現更低售價的情況下，小氣鬼會比奢侈鬼更有意願向商家要求退款。更重要的是，當商品價格偏高時，小氣鬼的退款意願會高於奢侈鬼，但在價格偏低時，兩類型消費者的退款意願沒有顯著差異。

Although price-matching guarantee are common in our life and these are one of the policies that retailers use to attract consumers, post-purchase behaviors has been ignored in the literature. Two experiments in this research examined the effect of individual difference in the pain of paying on post-purchase behaviors under price-matching guarantee. Experiment 1 showed that tightwads had higher post-purchase search intention than spendthrifts. Furthermore, tightwads’ search intention significantly differed from spendthrifts’ only when product price level was high. Consistent with the concept of price discrimination, experiment 2 demonstrated that tightwads had higher willingness to claim refund than spendthrifts when they found a lower price after they had purchased products at a store with price-matching guarantee. The article concludes by discussing the theoretical implications of the findings and suggesting directions for future research.

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