According to Nidumolu, Prahalad, & Rangaswami (2009), the central challenge for companies to make value chains sustainable is to increase efficiencies throughout the value chain. Several competencies are needed to overcome this challenge. For instance, companies need expertise in techniques such as carbon management and life-cycle assessment (Nidumolu, Prahalad, & Rangaswami, 2009); as well as the ability to redesign operations to use less energy and water, produce fewer emissions, and generate less waste. Besides, companies should have the capacity to ensure that their suppliers and retailers make their operations eco-friendly. (Nidumolu, Prahalad, & Rangaswami, 2009)
Wal-Mart is one of the well-known companies that are leveraging their buying power to increase sustainability throughout their supply chains. Recently, Wal-Mart made an announcement that it will require its suppliers to evaluate and disclose the full environmental costs of their products. It is worth to notion that when the world’s largest retailer makes an effort on value chains sustainable (Nidumolu et. al, 2009), asks more than 100,000 businesses around the world to assess their environmental and social sustainability, the responses may