How Ikea turned flat-pack furniture into a business worth billions

It doesn’t take long for Christer Collin and Ola Wihlborg to assemble the newest credenza from Ikea. Collin is a 42-year veteran of the company, specializing in product development. Wihlborg is one of the company’s most senior designers, having created dozens of pieces of furniture sold by the retailer since 2004. The two Swedes are lifting parts and turning hex wrenches in a second-floor conference room in Trnava, Slovakia, just outside the capital, Bratislava. This is where Inter Ikea Group...