無為慣性發生於人們錯過第一次較佳的機會之後，面對第二次次佳的機會時，其採取行動的可能性將會降低。過去無為慣性的研究多著墨於價格的促銷，因此本研究加入增量促銷的框架，作為過去研究之延伸。我們證實消費者錯過先前較佳優惠後，在面對增量促銷時，比起價格折扣會產生較高的行動可能性，即較低的無為慣性(實驗一)。這是因為商品以增量的方式促銷時，消費者較傾向聚焦在獲益；反之，當商品以折價的方式促銷時，消費者則較傾向聚焦在損失。我們進一步證實了認知焦點為促銷框架對無為慣性效果的隱含機制(實驗二)。藉著使用不同的促銷框架，我們複製了先前的研究結果，兩次優惠間的差異將影響無為慣性的程度(實驗三)。最後，我們納入產品類型，作為促銷框架對無為慣性的干擾因素。結果顯示當消費者面對良性品的增量促銷時，其無為慣性的效果依舊低於價格折扣；然而，當面對惡性品的增量促銷時，其結果將反轉，即面對增量促銷的無為慣性程度將高於價格折扣(實驗四)。

Inaction inertia means when people miss the first opportunity, their likelihood of action to the subsequent opportunity, which is not as good as the first one may decrease. To extend the prior research of inaction inertia primarily focused on price discounts, the current research considers the framing of bonus packs as a promotion alternative, examining the effect of inaction inertia between price discounts and bonus packs. We confirmed that consumers are more likely to act when the former opportunity is a price discounts promotion as compared with a bonus packs promotion (study1). It is due to the fact when products are promoted by bonus packs, people are susceptible to the gain; whereas products are promoted by price discounts, people are susceptible to the loss. We further demonstrate that the cognitive focus is found to be the mechanism underlining the effect of promotion framings on likelihood of action (study 2). Despite using different promotion tools, we also replicate the past finding that the likelihood of action upon a less deal is subject to the difference between deal attractiveness (study 3). Finally, we add in product types as a moderator of promotion framing to inaction inertia. The result shows that under the bonus packs promotion of virtue product, the effect of inaction inertia holds constant; however, the preference of promotions reversed under the bonus packs promotion of vice product (study 4).

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