Improve the national diamond. Companies have a vital stake in making their home environment a better platform for international success. Part of a company’s responsibility is to play an active role in forming clusters and to work with its home-nation buyers, suppliers, and channels to help them upgrade and extend their own competitive advantages. To upgrade home demand, for example, Japanese musical instrument manufacturers, led by Yamaha, Kawai, and Suzuki, have established music schools. Similarly, companies can stimulate and support local suppliers of important specialized inputs—including encouraging them to compete globally. The health and strength of the national cluster will only enhance the company’s own rate of innovation and upgrading.