Ikea will launch a UK online secondhand marketplace in the coming months, allowing members of its Ikea Family loyalty scheme to buy and sell pre-owned Ikea items directly with one another. The platform follows trials in Spain and Norway and arrives five years after the retailer began buying and selling used items in some UK stores. It enters a market already crowded by eBay, Facebook Marketplace, Vinted, Gumtree, and niche players like Vinterior. The structural move here is worth unpacking. This is not an open marketplace. It is a closed loop: only Ikea products, only Ikea members, with Ikea controlling the product data, pricing suggestions, and transaction infrastructure. In Spain, the platform pre-fills product descriptions and suggests prices — useful for sellers, but also a mechanism that keeps price discovery inside Ikea's information perimeter. Sellers who accept payment via Ikea gift card receive a 15% bonus on the sale price, a direct incentive to recycle revenue back into new Ikea purchases. Buyers in Spain will pay a 5% protection fee from January next year, mirroring Vinted's model. A Poäng armchair lists for €56, roughly half the new price. The economics are straightforward: Ikea captures transaction fees, drives loyalty-scheme enrollment, recirculates spending via gift cards, and wraps it all in a climate-positive narrative tied to its 2030 pledge to make all products from renewable, recyclable, and recycled materials. The UK secondhand market is increasingly contested. Vinted has expanded beyond clothes into homewares and electronics. eBay acquired UK fashion reseller Depop for $1.2bn. Electrical retailers Currys and AO both sell preloved items, with AO acquiring MusicMagpie in 2024 to boost its refurbished electronics position. Preloved items now account for about a tenth of global fashion sales. The pressure falls unevenly. Charity retailers like the British Heart Foundation have closed stores amid rising costs, squeezed as commercial players professionalize the resale space with better UX, logistics, and marketing budgets that charities cannot match. Ikea's climate framing is not dishonest — extending product life genuinely reduces material throughput. But the platform design ensures that the environmental benefit is inseparable from the commercial one. Every transaction reinforces brand loyalty, generates data on product lifecycles, and funnels spending back through Ikea's registers. The gift-card bonus is the tell: this is a retention engine dressed as a sustainability initiative. The question is whether a manufacturer-controlled resale loop is better or worse for consumers than the open-market alternatives. The pre-filled descriptions and trusted brand reduce friction. The walled-garden structure limits price competition and ensures Ikea captures value that would otherwise flow to platform-agnostic marketplaces. Both things are true simultaneously.