狄德罗效应：一次消费会改写周围物品的标准
狄德罗得到一件漂亮的红色睡袍以后，原来的家突然显得配不上它。他换掉地毯，添置雕塑、镜子和餐桌，最后连旧草椅也换成了皮椅。一件新东西抬高了参照标准，周围原本还能接受的物品，开始一个接一个显得陈旧。
这就是狄德罗效应。一次购买付出的不一定只有标价，它还可能带来一整套配套消费。新手机需要新耳机和保护壳，新衣服让旧鞋显得不协调，新家具又让整个房间都需要重来。花费从物品本身，扩散到了它所暗示的生活方式。
这条链在电子产品上最容易看见：买了外接屏幕，就该配一台笔记本；有了笔记本，又想要一台 iPad 写写画画；添了 VR，紧接着开始担心出门怎么办，于是又添一台轻薄本，好让"出门也要优雅"。家里那台能打游戏的一体机催出一台 PS5，PS5 联动了还不够，最后连"躺着也能玩"的掌机也备齐了。每一件东西单独看都说得通，串起来看是同一条链在往前拉。摄影、音响这类爱好者圈子把这套升级循环叫 GAS（Gear Acquisition Syndrome），算是狄德罗效应在器材上的专用说法。
它和 承诺升级 都会让小决定产生后续成本，理由却不同。承诺升级靠自我一致，狄德罗效应靠物品之间的新标准。奢侈品终将变成必需品 讲的是同一枚硬币的另一面：那张卡说的是新东西怎么被消费主义从"可以买"推成"不能没有"，这张卡说的是新东西怎么让周围的旧东西显得配不上它。新东西有时也会带来有用的整理，所以买之前更实际的问题是：除了这一件，我接下来还会觉得什么也必须一起换掉？
原笔记里的批注：
Note: Story #Insight
The French philosopher Denis Diderot lived nearly his entire life in poverty, but that all changed one day in 1765. Diderot’s daughter was about to be married and he could not afford to pay for the wedding. Despite his lack of wealth, Diderot was well known for his role as the co-founder and writer of Encyclopédie, one of the most comprehensive encyclopedias of the time. When Catherine the Great, the Empress of Russia, heard of Diderot’s financial troubles, her heart went out to him. She was a book lover and greatly enjoyed his encyclopedia. She offered to buy Diderot’s personal library for £1,000—more than $150,000 today.* Suddenly, Diderot had money to spare. With his new wealth, he not only paid for the wedding but also acquired a scarlet robe for himself. Diderot’s scarlet robe was beautiful. So beautiful, in fact, that he immediately noticed how out of place it seemed when surrounded by his more common possessions. He wrote that there was “no more coordination, no more unity, no more beauty” between his elegant robe and the rest of his stuff. Diderot soon felt the urge to upgrade his possessions. He replaced his rug with one from Damascus. He decorated his home with expensive sculptures. He bought a mirror to place above the mantel, and a better kitchen table. He tossed aside his old straw chair for a leather one. Like falling dominoes, one purchase led to the next. Diderot’s behavior is not uncommon. In fact, the tendency for one purchase to lead to another one has a name: the Diderot Effect. The Diderot Effect states that obtaining a new possession often creates a spiral of consumption that leads to additional purchases 《Atomic Habits》，Location 928
Links to this note
- Atomic Habits
吸引力也不只来自奖励本身。奖励预期会在奖励到来前推动行动 发生得更早，深层动机：习惯是古老需求的现代解法 继续追问，人究竟想改变哪一种感受。现代产品用 超常刺激：现代诱惑放大古老本能 把这股力量放大，群体则通过 群体规范：人会模仿亲近者、多数和强者 让某些行为显得理所当然。消费还有自己的连锁反应，狄德罗效应：一次消费会…
- 奢侈品终将变成必需品
消费主义会主动加快这个过程，把新东西从"可以买"推到"不能没有"。至于省时间的工具为什么常让人更忙，少看屏幕 里还有一个每天都能碰到的版本。狄德罗效应：一次消费会改写周围物品的标准 讲的是同一枚硬币的另一面：这张卡说的是新东西怎么被需求追着变成必需，那张卡说的是新东西怎么让周围的旧东西显得配不上它。
- 村上的报菜名
也见 狄德罗效应：一次消费会改写周围物品的标准、昂贵信号：有成本的行动比表达更可信。
- 财富是你看不见的那部分
奢侈品终将变成必需品 讲的是这份推力如何一步步把"可以买"推成"不能没有"，狄德罗效应：一次消费会改写周围物品的标准 则是它在个人层面的传动机构：一件新东西会抬高周围所有东西的参照标准，于是消费自己长出下一笔消费。 狄德罗效应制造"看得见的东西"，财富恰恰是抵抗住它之后剩下的那部分。