Diderot Effect

The philosopher Diderot received a gift: a magnificent dressing gown. Sitting in it, he noticed his old chair looked shabby. New chair. Then the desk looked wrong beside the chair. New desk. Within a year the whole room had been replaced, and the poor man was in debt — all because of one beautiful robe.

The pattern: possessions are not bought one at a time. They are bought as members of a set, and each new member judges the others. One upgrade makes the rest of your life look like a downgrade.

Watch it today. The new phone makes the headphones look old. The renovation of one room makes the whole house shabby. The promotion's salary upgrades the car, the street, the holidays — and the savings rate never moves.

The defence is awareness at the moment of purchase: this thing is not one thing; it is the first of a set. If you do not want the set, do not buy the robe. Or — the wiser trick — buy things that suit the life you already have.