In a transactional business nothing is promised. Every day starts at zero revenue, so the model's quality comes down to why the customer comes back unprompted. DMart and Costco have price trust. A chemist has habit and location. Amazon retail has assortment. The product has to be bought or built each time, so gross margins are structurally thinner and velocity is the engine. Profit = thin margin × enormous, fast-turning volume. That makes the great transactional businesses cost-obsessed logistics machines wearing a shop's clothing.
Transactional business model examples: DMart and Costco
DMart (India). At an illustrative ~FY25 scale, revenue is ~₹59,000 cr, gross margin ~14 to 15%, EBITDA ~8% and PAT ~₹2,700 cr (~4.6%). The design choices lock together. DMart owns its stores, so depreciation runs ~1.3% of sales instead of rents that inflate. It clusters stores densely, which cuts distribution cost. Stocking fewer SKUs than rivals makes turns rise and shrinkage fall. It pays suppliers in about a week and earns cash discounts for it. And it prices 6 to 15% below MRP, so traffic compounds. Every one of those choices gives up margin to buy velocity and trust. Together they make a flywheel, which you'll see in full on the flywheel effect page.
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Costco (US). Costco is the most instructive retailer on earth, because it runs the transactional model at cost and charges you for admission. In FY24 (illustrative, ~actuals; pull the 10-K), total revenue was ~$254bn. Membership fees were ~$4.8bn of that, under 2% of revenue, while operating income was ~$9.3bn. So roughly half of Costco's operating profit is the membership fee line. Merchandise carries a markup cap of ~14% on national brands and ~15% on Kirkland private label, per long-standing company practice. That produces a deliberately skinny ~11% gross margin. Meanwhile ~90%+ of members renew (US/Canada ~93%). Look at what the design achieves. The product P&L runs near breakeven to make the membership annuity unassailable. A transactional business has turned its profit line into a subscription. Keep Costco in mind for when you go hunting for profit engines, because here the engine is a 2% revenue line.
What should you check in the filings?
What to check in filings: start with same-store sales growth. Split it into price and volume where that's disclosed. Then look at the gross margin trend. A falling margin can be strategy (the flywheel again) or distress, and turns and share tell you which. Check inventory turns and the cash conversion cycle too. Store economics matter as well: sales per sq ft and payback per store, which store-level unit economics formalises.