Add-on selling with context effects
研究消费者在购买过程中对附加商品价格不敏感的现象，发现当附加价格占总支出比例较小时消费者更易购买，这削弱了基础商品市场竞争，损害了消费者福利和总福利。
A common practice is to offer optional extras or upgrades during the purchase process. This paper studies endogenous consumer insensitivity to such additional prices: we posit that consumers are more prone to buy these overpriced extras when they represent a smaller share of total expenditure. The presence of such context-sensitive consumers softens competition in the market for the base good, jeopardizing their own surplus but also that of consumers with standard preferences. Exploitation of context effects by firms reduces total welfare.