There's a razor in my bathroom that cost me $4. The blades I've bought for it over the past year? Somewhere north of $80. I'm not mad about it. I'm fascinated by it. Because that pricing gap is the entire thesis behind complementary pricing, and it's been working on consumers (including me, apparently) for over a century.
Complementary pricing is a strategy where a company intentionally prices a core product low (sometimes at or below cost) to drive adoption, then generates profit from the complementary products or services that accompany it. The core product is the hook. The complement is where the money lives.
This is sometimes called captive product pricing, razor-and-blade pricing, or tied product pricing. The names vary but the mechanics are identical: make the entry point cheap, make the ongoing consumption profitable.
The key economic insight is that the two products have a negative cross-price elasticity. When the price of the core product goes down, demand for the complement goes up, because more people buy into the ecosystem. That's the mathematical foundation of the whole strategy.
The poster child for complementary pricing is King C. Gillette, who in the early 1900s essentially gave away safety razors to sell blades. The story has been somewhat mythologized (Gillette actually charged for the razors initially), but the strategic pattern he established became one of the most replicated business models in commercial history.
What Gillette understood was that the razor is a one-time purchase, but blades are a recurring one. The lifetime customer value of a blade buyer far exceeded the margin on any single razor sale. He was, in effect, doing customer equity math before the term existed.
The strategy follows a predictable pattern across industries:
| Industry | Core Product (Low Price) | Complement (High Margin) | Margin Structure |
|---|---|---|---|
| Razors | Razor handle ($4-10) | Blade cartridges ($3-6 each) | 80%+ margin on blades |
| Printers | Inkjet printer ($50-150) | Ink cartridges ($25-50 each) | Ink is one of the most expensive liquids by volume |
| Gaming | Console ($400-500) | Games ($60-70 each) + subscriptions | Hardware sold near cost; software is profit |
| Coffee | Nespresso machine ($100-200) | Coffee capsules ($0.70-1.10 each) | Capsules drive 95%+ of lifetime profit |
| Smartphones | Subsidized phone ($0-200 with plan) | Monthly service plan ($50-150/mo) | Carriers recoup phone cost in 3-6 months |
The pattern is always the same: the core product creates switching costs, and the complement generates recurring revenue within those switching costs.
What I find most interesting about complementary pricing in 2026 is how it's evolved beyond physical products. The SaaS model is essentially complementary pricing in digital form: freemium tiers are the "razor" (free or cheap entry), and premium features or seat licenses are the "blades" (where the money is).
Consider how this plays out:
The digital version of complementary pricing is even more powerful than the physical version because digital switching costs are often higher (your data, your playlists, your reading history) and the marginal cost of the complement approaches zero.