The most noticeable difference is the term innovation, which did not appear in the 1990 concept, although implied, because companies and other entities within the ecosystem and their relationships stimulate the development of new technologies and accelerate learning.[3] Porter´s emphasis was on competitive advantage achieved through easier access to skills, suppliers, customers, specialized information, and complementary products and services which leads to lower costs and higher quality. In Porter's definition "industrial homogeneity" was a crucial aspect to distinguish amongst clusters, e.g. leather fashion, wine, microelectronics.[4]