Retailers make money by buying products wholesale and selling them at a markup, but that’s only the first layer. On top of merchandise margin, most modern retailers earn from private label brands, fees charged to the manufacturers who want shelf space, advertising sold to those same brands, store credit cards, extended warranties, delivery and installation services, and increasingly return fees. That stack is why a grocery chain can survive on 1% to 3% net profit while a department store with a branded credit card and a warranty desk earns considerably more per customer.
Markup Is the Foundation, Not the Whole Story
Every transaction starts with the same math. A retailer buys a jacket wholesale for $50, sells it for $100, and books a 50% gross margin on that item. Gross margin has to cover rent, wages, utilities, insurance, marketing, and technology before anything reaches the bottom line. What survives all of that is net profit, and across much of the industry it lands in the low single digits. Grocery stores historically run 1% to 3% net. For every $100 in sales, the store keeps $1 to $3.
Manufacturers often publish a suggested retail price, but retailers set the shelf price based on local competition, demand, and their own costs. The gap between wholesale and retail funds the operation; it isn’t profit until everything else has been paid.
Volume vs. Margin Per Item
Profit per item is only half the equation. A grocery store earns pennies on a carton of milk but sells thousands of cartons a week. That’s the high-turnover model: replenish stock dozens of times a year and let volume produce meaningful total profit on thin per-unit margins. Luxury retail runs the opposite model. A designer handbag might sit on display for months, but a single sale can carry thousands of dollars of margin. Same industry, entirely different economics.
Private Label Brands Raise the Margin
One of the most effective ways retailers lift margins is by developing their own store brands. Instead of stocking only national brands (whose wholesale prices include the manufacturer’s advertising budget), a retailer contracts directly with a factory to produce goods sold under the store’s label. The same plant that makes a name-brand cereal might produce a nearly identical private label version at a lower cost.
The advantage shows up in the numbers. Research from Dartmouth’s Tuck School of Business found retail gross margins averaged around 25% in categories with high private label penetration, compared to roughly 20% where store brands had little presence. Five percentage points goes straight to the bottom line.
There are costs. The retailer takes on quality control, packaging, and branding, and any defect or recall lands on the retailer’s reputation. Trademark due diligence is part of the price of entry, since the retailer’s branding has to avoid confusion with existing marks under the Lanham Act.1Cornell Law Institute. Trademark Infringement Product liability insurance is standard, with general liability coverage typically starting at $1 million.
Fees Paid by the Manufacturers on the Shelves
Retailers don’t only earn from consumers. They collect substantial fees from the manufacturers who want access to their shelves, effectively renting out the sales floor as commercial real estate.
Slotting fees are the upfront payment a manufacturer makes to get a new product placed. According to an FTC workshop report, these fees can run $75 to $300 per item per store, and one industry estimate put the cost of introducing a small four-item product line across all U.S. supermarkets at roughly $16.8 million.2Federal Trade Commission. Report on the Federal Trade Commission Workshop on Slotting Allowances and Other Marketing Practices in the Grocery Industry Premium placements like eye-level shelves and endcaps cost more.
Promotional allowances are separate. Manufacturers pay retailers to feature their products in circulars, in-store displays, and digital coupon programs. Under the Robinson-Patman Act, these allowances must be offered on proportionally equal terms to competing retailers, so large chains can’t extract exclusive deals that shut smaller stores out.3Federal Trade Commission. Price Discrimination: Robinson-Patman Violations The law does allow price differences that reflect genuine cost savings, such as lower per-unit shipping when a retailer buys in bulk, so large retailers legally pay less per unit as long as the discount tracks actual cost differences.4Office of the Law Revision Counsel. 15 USC 13 – Discrimination in Price, Services, or Facilities
Retail Media Networks
This is where the model has shifted most dramatically. Major retailers now operate advertising platforms, called retail media networks, that let brands pay for prominent placement in search results, banner ads, and sponsored product listings on the retailer’s site and app. It’s the digital version of slotting, only far more profitable because digital ad inventory can be created almost infinitely and targeted with the retailer’s own customer data.
U.S. advertisers are projected to spend over $71 billion on retail media in 2026, up from roughly $60 billion in 2025. Amazon holds nearly 80% share. Walmart Connect generated $6.4 billion in ad revenue in 2025 alone, and Target, Instacart, and DoorDash each run their own growing platforms. Ad margins dwarf traditional merchandise margins, which is why a grocery chain running on 2% net can earn dramatically more from selling ad space to the brands already on its shelves than from selling the products themselves.
These networks now extend beyond the retailer’s own properties. Walmart and Amazon sell off-site advertising, using shopper data to target ads across the broader internet. Loyalty programs feed this directly: retailers can offer advertisers verified data on what specific customers actually buy, not just what they browse.
Warranties, Delivery, and Other Add-On Services
When a cashier asks if you want a protection plan on your new laptop, they’re offering one of the highest-margin products in the store. Extended warranties cost relatively little to provide because most covered products never need repair during the warranty period. Industry estimates have placed profit margins on extended warranties in the 50% to 60% range for major electronics retailers. The Magnuson-Moss Warranty Act requires service contracts to be clearly disclosed and distinguished from the manufacturer’s included warranty.5Office of the Law Revision Counsel. 15 USC Chapter 50 – Consumer Product Warranties
Installation, delivery, assembly, and tech support subscriptions do similar work. They convert labor into a billable product with predictable costs. A furniture retailer charging $150 for delivery and assembly on a $600 couch is often earning more on the service than on the furniture.
Store Credit Cards and Financing
Store-branded credit cards let a retailer earn from the same customer twice: once on the merchandise and again through interest. These cards carry some of the highest interest rates in consumer lending. The average APR on a store-only card now exceeds 31%, well above rates on general-purpose cards. Regulation Z under the Truth in Lending Act requires clear disclosure of the rate before the account opens, but federal law does not cap the rate itself.6Consumer Financial Protection Bureau. 12 CFR Part 1026 – Truth in Lending (Regulation Z)
Late payment fees add another layer. Federal regulations currently set safe harbor amounts at $27 for a first violation and $38 for a repeat violation within six billing cycles.7Consumer Financial Protection Bureau. 12 CFR 1026.52 – Limitations on Fees The CFPB finalized a rule in 2024 that would have reduced the cap to $8, but that rule has been stayed due to ongoing litigation and is not currently in effect.8Consumer Financial Protection Bureau. Credit Card Penalty Fees Final Rule The existing safe harbor amounts remain the benchmark.
Store cards also drive loyalty. Cardholders tend to shop the issuing retailer more often and spend more per visit than non-cardholders, so the card boosts core merchandise revenue alongside the financial income.
Return and Restocking Fees
Processing a return is expensive. Shipping, inspecting, repackaging, and restocking a returned item can cost a retailer anywhere from $10 to $65 per unit depending on category, with electronics running highest because of testing and refurbishment. For years most retailers absorbed the cost. That’s changing.
A growing number of major retailers now charge return fees, especially on online orders shipped back by mail. Apparel retailers typically charge $4 to $12. Electronics stores may charge restocking fees of $45 or more on smartphones and tablets. The fees offset the direct cost of reverse logistics and discourage casual returns, which reduces the volume of merchandise that has to be resold at a discount or written off.
Shrinkage: The Drain on Everything Above
Not every product that enters a store leaves through a register. Retail shrinkage, which includes shoplifting, employee theft, administrative errors, and vendor fraud, costs the industry well over $100 billion annually. Average shrink rates run around 1.4% to 1.6% of total sales, which sounds small until you set it against net profit margins in the same range. For a grocery store operating on a 2% margin, a 1.5% shrink rate wipes out nearly half of what should be profit.
Loss prevention is effectively a revenue strategy. Every dollar of shrinkage prevented drops straight to the bottom line. Enterprise systems using RFID tags, AI-powered surveillance, and data analytics can run six figures per location, but the return is straightforward when the alternative is losing 1.5 cents of every sales dollar.
Put it all together and retailing is less a single business than a stack of them: a merchandise business earning a few points of margin, a real estate business renting shelf space to suppliers, an advertising business selling attention on a captive audience, a financial services business earning interest on store cards, and a service business selling warranties and delivery on top. The retailers that thrive on 2% net margins do it by making sure every one of those layers is pulling its weight.