Food-basket research / a worked example
A grocery price can exist and still leave a food-basket gap
Five recorded listings show why product variants, package units and missing weights need separate checks before a basket comparison.
Finding a price for “milk” is only the first step in costing a defined basket. The fat percentage, variant and package size still need to fit the item the study intends to measure.
The retained Toronto observations include ordinary 2% milk at $6.44 for 4 L at Loblaws and a microfiltered listing at $6.25 for 4 L at No Frills. The latter is excluded from our example target of ordinary 2% milk. The lower listed price does not resolve the variant difference.
Three checks answer three different questions
Food definition: does the form and variant fit? Package basis: are we comparing a stated volume, count, mass or whole item? Analysis weight: if a calculation requires kilograms, do we actually have the mass?
| Example target | Recorded listing | Review |
|---|---|---|
| Ordinary 2% milk, 4 L | 2% MilkLoblaws · 4 l, $0.16/100ml · $6.44 | Food specification fitsFat percentage and 4 L package fit this example. Brand equivalence needs separate review.Weight: Volume stated; mass not assumed. |
| Ordinary 2% milk, 4 L | 2% Microfiltered MilkNo Frills · 4 l, $0.16/100ml · $6.25 | Variant excludedMicrofiltered milk is a different variant and is excluded from the ordinary-milk comparison.Weight: Volume stated; mass not assumed. |
| Broccoli crown, one head | Broccoli FloretsFortinos · 500 g, $0.60/100g · $2.99 | Form and unit excludedFlorets in a 500 g pack do not match one broccoli crown.Weight: 500 g package; no whole-head equivalence. |
| Romaine lettuce, one head | Romaine LettuceNo Frills · 1 ea, $2.49/1ea · $2.49 | Food specification fitsThe head basis fits; a weight-based analysis still needs a measured mass.Weight: Head mass unavailable. |
| Pure canola oil, 946 mL | Compliments Canola Oil 100% Pure 946 mlFreshCo · 946 ML · $4.29 | Food specification fitsOil type and the 946 mL pack fit this example.Weight: Volume stated; mass not assumed. |
A package conversion cannot fix a different food
A 500 g bag of broccoli florets does not match a target of one broccoli crown. Dividing its price by a guessed crown weight would add an assumption without fixing the food-form difference. The example keeps that listing excluded.
A valid item price can still have an unknown weight
A romaine head can fit a per-head target while its mass remains unavailable. A study that needs kilograms must obtain a measured weight or document its own estimation method. Likewise, 4 L of milk and 946 mL of oil state volumes; this example does not turn those volumes into assumed masses.
A useful assessment therefore returns a coverage checklist alongside the price file: fits, excluded variants, unavailable items and missing measurement fields. It helps the analyst decide which gaps matter to the actual research question.
Evidence and scope
Source: a fixed extract of GroceryPulse’s historical advertised-price observations for Toronto. Every price shown here was captured October 1, 2026; the retained extract and literal product/package facts were reviewed October 7. Store names, listing titles, package descriptions and dates remain in the downloadable CSV.
The five target specifications illustrate a mapping review. They are not a completed mapping of any official food basket, and they do not estimate the mass of whole produce. Advertised prices may differ from a location’s checkout prices.
The observations are historical examples for evaluation and citation with GroceryPulse attribution. Full feeds and custom collection have separate scopes and licensing terms.
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