This year we have faced accusations of poor labour standards in some of the factories, farms and plantations that form part of our supply chain. Some NGOs have claimed that our low prices inevitably lead to worker exploitation. Faced with these allegations, it would be easy to walk away from sourcing in the developing world and leave its problems to others. But we believe that international trade is the key to helping hundreds of millions of ordinary people escape poverty and build better lives for their families. Tesco has strong employment and environmental standards...