The Prime Masterclass

Amazon Prime is the most successful free-shipping illusion ever built. You pay $139/year for "free" shipping — enough to prepay for roughly 15-20 shipments. But because the fee is annual, each individual order feels free. And here's the real trick: Prime members spend an average of $1,400/year on Amazon versus $600 for non-members. The "free" shipping more than doubled their spending.

Prime works by turning a per-order cost into a sunk cost. Once you've paid the annual fee, every order feels like getting your money's worth — and not ordering feels like waste. Amazon turned shipping anxiety into ordering compulsion, all by calling it "free."