In The Keystone Advantage, Marco Iansiti and Roy Levien offer a new lens for understanding how these ubiquitous and complex business networks behave and explore the implications for strategy formulation, innovation, and operations management. Iansiti and Levien argue that biological ecosystems provide a powerful analogy to the functioning of business networks. Just as "keystone species" in nature play central roles in their ecosystems, companies such as Walmart, Microsoft, and Li & Fung deploy "keystone strategies" to actively shape and regulate the workings of their business ecosystems--dramatically improving their own performance in the process.