In 1974, Tversky and Kahneman spun a rigged wheel that landed on either 10 or 65, then asked people what share of UN member states were African. Median answer: 25% after seeing 10, 45% after seeing 65. A plainly irrelevant number had dragged their judgment toward it. That's the anchoring effect, and negotiators use it every single day.
Remembering is not replaying a recording — it is rebuilding. Each time you recall a memory, it becomes temporarily malleable and can be altered before being stored again. That is why two people can sincerely remember the same event… differently.
In 2003, Johnson and Goldstein compared European countries. Where you must tick a box to become a donor, consent rates ranged from 4% to 28%. Where you're a donor by default unless you opt out, they topped 85%. People aren't more generous on one side; most simply stick with whatever option was chosen for them.