Bulk is a feeling. Unit price is a number. These three trips show how often the feeling loses.

Receipt scene 1: the family-value paper towels

Shelf: bright yellow "family value" on a six-pack at $12.99. Cart feels smart. Receipt later: cost per sheet loses to the quieter mid-size at $6.49. The yellow flag sold size. It did not sell value.

What Basket would have shown before the aisle: mid-size saves about $4.50 across the sheets you actually use before the pack goes dusty. Bulk only wins when you finish it.

Receipt scene 2: the coffee bag that "should" be cheaper

Warehouse bag: 28oz at $18.99. Habit bag: 12oz at $9.49. The big bag feels like a win until you divide. Per ounce, the 12oz often wins, and it finishes before the grounds go stale.

Swap math in dollars: if the store-brand 12oz lands at $6.29 against your $9.49 habit, that is $3.20 back on a repurchase you already planned. No warehouse membership required.

Receipt scene 3: the jug you will not finish

Giant detergent: the sticker looks loud and the unit price per wash looks fine, until half the jug sits under the sink for months because the scent is wrong or the household switches brands. A cheaper-per-wash jug you abandon is a more expensive jug.

Finish rate belongs in the decision. Unit price without finish rate is aisle theater.

The only bulk rule worth keeping

• Better unit price and you will finish the pack → buy bulk.
• Worse unit price → buy the mid-size, ignore the yellow flag.
• Better unit price but you will waste half → buy the mid-size anyway.

Three receipts. One rule. Bulk is optional. Unit price is not.