Retail cases: follow the basket, the margin and the stock

Follow merchandise from purchase to return

A retailer chooses an assortment, buys or arranges merchandise, moves it to a selling location, attracts customers, completes purchases and handles fulfilment and returns. Determine who owns the inventory. An own-stock store earns the difference between net selling revenue and its relevant costs; a marketplace may earn a fee on transactions it facilitates. Gross merchandise value and the platform's revenue therefore need separate definitions.

Some retailers also earn memberships, services or other income. Costco's FY2025 report provides a real example: it reports net merchandise sales separately from membership fees. Do not silently add such a revenue stream to a fictional store whose brief supplies only merchandise sales. Read Costco's business and income statement.

Scope the decision to a category, store, channel or entire network. An online order collected in a store can use both channels, so counting it twice would overstate total demand.

Build sales and contribution from observable activity

A store's simplified sales funnel is visits × purchase conversion × items per transaction × net revenue per item. Alternatively, use transactions × average net basket value. Do not multiply by items again if basket value already includes them. For online channels, define sessions, users and orders before calculating conversion.

Net sales should reflect the stated discounts and returns. Then subtract merchandise costs and the fulfilment, payment or service costs relevant to the choice. Gross margin is not necessarily contribution after all channel costs. Tractor Supply warns in its FY2025 filing that retailers classify some distribution costs differently between merchandise costs and selling expenses. See the gross-margin comparability note.

An average basket can rise because prices rose, shoppers bought more items or demand shifted to expensive products. Compare those effects before attributing the change to stronger demand. A new store can add network sales while reducing sales at nearby existing stores.

Match period flows to inventory balances

• Conversion (%): transactions ÷ eligible visits, using a consistent channel and period.
• Gross margin (%): net sales less defined merchandise cost, divided by net sales. Keep cost classification consistent.
• Comparable sales growth (%): growth for the stated eligible stores and channels over matching periods. Check openings, closures, currency and week counts. Costco discusses shopping frequency and average ticket as drivers of its comparable sales. Read its comparable-sales discussion.
• Inventory turnover (times per year): annual cost of goods sold ÷ average inventory at cost. Revenue divided by retail ticket-value inventory is a different measure.
• Sell-through (%): units sold ÷ the explicitly defined units available for the assortment and period.

Inventory is a stock at a date; purchases and sales are flows over time. Rapid growth can require inventory purchases before customers pay; supplier terms determine when that funding is needed. An end-of-year stock balance may miss a large seasonal peak, so ask for periodic balances when funding or availability matters. Low stock can improve cash while causing missed sales.

Evaluate a markdown with remaining stock included

Practice figures. A temporary shop starts its final month with 1,000 units already purchased for $20 each. It cannot replenish. Every unit left at month-end is sold to a clearance buyer for a net $16, after all clearance costs. There are no returns or other variable selling costs.

Shop demand is incremental to the clearance buyer; the buyer accepts all remaining units at the same net price under either alternative. Fixed shop costs are unchanged.

Question: Which choice gives the larger total contribution after the inventory purchase cost and campaign? Could more shop volume make the $30 markdown match keeping price?

Choose evidence that can change the retail action

For pricing, compare incremental demand with margin lost on existing sales and the value of remaining stock. For assortment, request item-level contribution, space or handling needs and substitution between products. For a fulfilment change, compare complete order economics, returns and peak delivery capacity.

A useful recommendation states the category and horizon, the contribution or cash outcome, and what would reverse the choice. In the example, demand above stock capacity cannot rescue the markdown; a different clearance value or price could. For a wider launch, test those inputs and check supplier terms before extrapolating a small trial across stores.