GlobalNetXchange (GNX), the retailer-led online supply network, was due to float about now but its owners, including Carrefour and Sainsbury's, are having a rethink. While investment in supply chain management technology is growing by almost 28% per year, with a healthy chunk going towards online procurement, GNX's profit-seeking model has deterred many retailers. Even the main participants have been complacent about putting orders through the system. GNX's owners have a lot to prove before they can attract much investor interest.