Blog / Supermarkets
How to actually compare two grocery shops
A receipt total is misleading when the baskets are different.
Lleno · September 1, 2026 · 4 min read
“It is cheaper over there” is a familiar parking-lot conversation. Sometimes it is true. Sometimes you compared a chicken with a different chicken.
Three traps
Package size. 900 g is not a kilogram. Compare the price per unit.
Basket. A $1,200 receipt with detergent and a $1,200 receipt with meat do not tell you the same thing about a store.
Timing. A Tuesday promotion does not beat Saturday’s regular price. It beats that Tuesday’s price.
Weak comparison
Receipt totals recalled from different stores, in different weeks.
Useful comparison
The same 12 products, the same package sizes, unit prices and week.
A notebook method
- Choose a short basket you actually buy.
- Record brands and grams, not just generic names.
- Divide prices by the relevant unit: liter, kilogram or item.
- Repeat at the other store in the same week.
- Leave the total until the end.
Keeping both receipts gives you evidence to compare later. Lleno’s planned analysis is meant for this kind of question, rather than ranking every chain from one household’s month of purchases.
Hallazgo
The “cheapest store” is a property of a basket, not a logo.
Wholesale and convenience
Wholesale can make sense when you finish the package. Convenience can make sense when time matters. Delivery fees, missing items and extra trips also belong in the comparison.
Methodology
This article does not identify a winning chain or publish collected price differences. Such claims require observed prices, a location and a defined basket.
Sources