Why is IKEA's flatpack not just packaging, but a business design that changes the customer's role after checkout?

Answer: Customer participation

Easier transport only — Easier transport only is plausible because flatpacks really do make shipping and storage more efficient. But the question asks how the customer's role changes after checkout. The business design also shifts pickup, carrying, and assembly work toward the buyer.

Customer participation ✓ — The flatpack turns the buyer into part of production: transport is denser, storage is easier, and the customer completes assembly at home. IKEA Museum treats flatpacks as central to the model, and IKEA Global says packaging is designed in. The lower price is tied to shared work.

Staff-only service — Staff-only service sounds like traditional furniture retail. IKEA's model reduces that reliance by letting customers pick up and assemble many products. The customer is not only a delivery recipient but an active finisher.