Every Black Friday, someone lines up outside a Best Buy at four in the morning for a television priced at ninety-nine dollars, a fraction of what it costs the week before or the week after. The store has ten of them. Two hundred people are waiting, and almost all of them will walk out having bought something else entirely, at full price, because the drive to the store already happened before anyone reached the register.
That's arithmetic dressed up as a bargain, not an act of generosity.
Retailers actually have two names for what just happened, describing slightly different tools built around the same idea. A doorbuster is a severely discounted item stocked in a quantity small enough that the store can absorb the loss without denting its overall margin, used specifically to pull bodies through the door on a single high-traffic day. A loss leader is the same trick stretched across the calendar. At the back of the supermarket, milk gets priced near cost, and a rotisserie chicken sells for less than the raw ingredients would cost a home cook. A game console, meanwhile, goes for less than the manufacturer charges the retailer for it. Both work only because almost nobody walks into a store, buys exactly the discounted item, and leaves.
Retailers profit on the basket, not the item. A shopper who drives across town for a nine-dollar rotisserie chicken tends to leave with forty dollars of side dishes, drinks and paper towels bought at ordinary margin, and it's that second purchase that pays for the first. Manufacturers profit too, in a quieter way. A TV or a game console sold at a loss builds the installed base that later sells accessories, subscriptions and replacement units. That's why a supplier will sometimes chip in co-op advertising money specifically to fund the discount. Attention is what the store is really buying, and it is worth more than the item that bought it.
Those who pay are the ones who show up for the ad and leave empty-handed.
Doorbuster quantities are set deliberately thin, because the tactic's entire value depends on the item feeling scarce enough to create urgency in a flyer, and it can never be plentiful enough to actually dent the store's margin across everyone who wants one. Consumer protection law has a name for the worst version of this: bait and switch. That means advertising a product with no real intention or capacity to sell it, then steering the disappointed shopper toward something pricier. Most retailers stay a step back from that line by stocking a real, if tiny, batch of the discounted item and posting a one-per-customer limit. That satisfies the letter of advertising rules while preserving almost all of the marketing effect for almost none of the actual discount exposure.
This creates a fairly clean incentive. The smaller the promised discount inventory, the better the ratio of marketing buzz to real cost, so long as enough people still believe they have a shot at getting it. A retailer has every reason to advertise the deepest possible cut on the thinnest possible stock, since word of mouth and a scarcity-driven headline do the rest of the work for free. That's also why doorbusters cluster on the single biggest shopping days of the year rather than being spread evenly through the season. Concentrating the fake abundance into one date maximizes the crowd, and the crowd is the product being sold to every other department in the store.
Online retail has changed the shape of the tactic without removing its logic. A physical doorbuster is capped by how many boxes fit on a pallet. A website can, in theory, show real-time inventory and let a countdown clock do what the parking-lot line used to do. In practice, many retailers have simply moved the scarcity indoors. Store credit cards, paid membership tiers and early-access logins that open an hour before the general public's now hide the best prices. A velvet rope replaced the sidewalk line, but the underlying math didn't change: subsidize a few units to pull traffic toward everything else.
Two things could break the pattern. Enforcement is one.
State attorneys general and the FTC already police the most blatant bait-and-switch cases, but proving that a retailer's advertised stock was unreasonably thin, rather than merely popular, is a hard case to build after the fact, and most disputes get settled well before a court tests the standard. The other lever is inventory transparency. If a retailer had to disclose exact stock counts alongside every doorbuster ad, the tactic would lose most of its power. The scarcity that drives the crowd depends on shoppers not knowing the odds are bad. Neither change looks likely to arrive through regulation alone. It would probably take a large retailer deciding that transparent inventory numbers build more loyalty than mystery drops do, with competitors following out of necessity rather than conviction.
Retailers already know the doorbuster's core audience, the line-camper willing to trade four hours of sleep for a ninety-nine dollar television, is shrinking. More of that traffic gets captured through apps, credit cards and loyalty tiers instead. What isn't settled is what replaces it once the sidewalk line disappears entirely. One possibility is a genuinely open discount available to anyone who logs in at the right second. The other is a quieter sorting of customers by how much personal data and store loyalty they're willing to hand over, just to be told they might get the deal.