Every November, the same scene plays out. A retailer announces a doorbuster so absurd it makes the local news, a crowd forms in the dark, and by sunrise the thing is gone. What most shoppers never see is the math behind that spectacle. The doorbuster was never really about selling you that one cheap item. It was about getting you through the door while your defenses are down, and it works almost every time.

Here’s what’s actually happening. A doorbuster is a loss leader, which means the store expects to lose money on it. That’s fine with them, because the point isn’t the television or the air fryer or the robot vacuum. The point is the two hundred people who walk in behind you and leave with wrapping paper, batteries, a winter coat, and a phone case they never planned to buy. The advertised item is bait. Real profit comes from everything else in the building, and the layout on Black Friday is engineered so you pass plenty of it on your way to the thing you came for.

Then there’s the fine print, and it’s not decorative. Limited quantities. No rain checks. One per customer. While supplies last. Some stores hand out tickets hours before opening, which sounds fair until you realize the number of tickets is usually a fraction of the crowd. If you’re not near the front of the line, you’re not competing for the deal. You’re competing for the consolation prize, which is whatever else the store put on sale that day.

The trickier problem is that many Black Friday products aren’t the same products you’d find in October. Manufacturers build derivative models specifically for the holiday: same brand, slightly different model number, cheaper panel, fewer ports, smaller warranty. That’s why price comparison sites sometimes shrug at a Black Friday television. There’s no price history because the model didn’t exist two weeks ago. It was born to be discounted, and it will quietly disappear in January.

So write down the exact model number before you buy anything. Search that number, not the brand name. If the only results are Black Friday ads and a couple of sketchy listings, you’re looking at a derivative, and you should judge it on its own specs rather than the logo on the bezel.

The same skepticism applies to the “was” price. Retailers have wide latitude in what they list as the original price, and a discount off an inflated number is just a number. The honest comparison isn’t the sticker price from last Tuesday. It’s the lowest price that item has actually sold for in the past six months. A few minutes with a price tracker will tell you more than any red banner ever will.

Decide what you want before you leave the house. A short list with a maximum price next to each item keeps you honest when you’re standing in a loud store at six in the morning. Know your categories, too. Televisions tend to bottom out around Black Friday, but laptops often hit their floor during back-to-school season, and toys frequently get cheaper in mid-December when retailers panic about leftover inventory. Cyber Monday skews toward smaller electronics, subscriptions, software, and online-only brands, which is where some of the genuinely good pricing hides.

Accessories are where they get you. Cables, mounts, memory cards, extended warranties, cases, and setup services carry margins that make the doorbuster look like charity. The clerk who saves you forty dollars on a laptop will happily sell you a hundred and twenty dollars of add-ons. Say no, politely, and buy the cable somewhere else for eight bucks.

A deal is only a deal if you were going to buy the thing anyway. If you walk out with a ninety-nine dollar television and two hundred dollars of stuff you didn’t need, you didn’t beat the system. You funded it. The people who win Black Friday aren’t the ones who wake up earliest. They’re the ones who know exactly what they want, what it normally costs, and what they’re willing to pay before the doors ever open.