Why do people forget receipts so quickly?
We remember decisions, not their paperwork.
A receipt is an exact record, but human memory does not operate at that level of detail after a decision is completed.
The mechanism is cognitive compression. The brain stores the outcome of a purchase rather than its documentation.
Micro-case: A person buys a sandwich, folds the receipt, and later cannot remember where it was placed — not because it is lost, but because it was never encoded as important.
Aha moment: the receipt is not forgotten because it is weak information, but because its job ends immediately after the purchase.
Second-order effect: digital receipts reduce friction in spending awareness, making transactions feel even more abstract over time.
What looks like forgetfulness is actually efficient memory filtering.
