3 levers in the phrase "just for you"
The same offer can be presented 2 ways. "A promotion for all customers" - and you weigh the terms. "I held this for you" - and you're already weighing the relationship. In the second case, the question changes: not "is this a good deal?" but "would it be rude not to reply?"
There are 3 levers here. Scarcity: things in short supply seem more valuable - in a 1975 experiment, people rated the same cookies more highly when they took them from a jar containing 2 rather than 10. Personal address: the word "you" shifts the conversation from "compare options" to "respond to a person." A favor: if an exception was made for you, it creates a sense of obligation, and you want to repay it.
The more levers in one phrase, the less room there is for the question "do I even need this?" The seller may not even be lying: it really might be the last spot. But you can't check, and you have to decide now - that's what the whole gap rests on.
Why text written for everyone feels like it's about you
In 1948, psychologist Bertram Forer gave students "personality test results." Everyone got the same text, assembled from newspaper astrology: "you can be too hard on yourself," "it's important to you that people value you." On average, students rated the description's accuracy 4.3 out of 5.
A personality description written for everyone: accuracy 4.3 out of 5
Recognition is what works: the vaguer the description, the easier it is to find yourself in it. An email saying "we picked this especially for you" works the same way - general enough to fit anyone, personal enough for you to insert yourself. No one picked anything. You did the inserting.
The effect isn't foolproof, though. As soon as scarcity looks staged - the counter resets every morning, "last spots" stay up for months - the phrase starts working against the seller: trust drops along with desire. And in experiments, the strength of the effect varies noticeably from product to product and depending on whether a person believes the scarcity at all. The mechanisms themselves - both scarcity and personal address - are reliably supported by experiments, but their strength is not: no one can say in advance how well a particular email will work.
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Sources
- Worchel, Lee & Adewole, 1975 - cookie jar experiment
- Forer, 1948 - ratings of a "personal" description, average accuracy 4.26 out of 5
- reviews of the scarcity effect in advertising show considerable variation in strength