Update: So, because a bunch of people looked at this page, I wrote something about the complementary assets of a successful social movement organisation.
…and complementary assets (complementary products, services, network infrastructures.) Page 87 Bergek, Hekkert and Jacobsson (2008) in Foxon, Kohler and Oughton
Complementary assets are assets, infrastructure or capabilities needed to support the successful commercialization and marketing of a technological innovation, other than those assets fundamentally associated with that innovation. The term was first coined by David Teece.
Rothaermel, Frank T. 2001. Complementary assets, strategic alliances, and the incumbent’s advantage: an empirical study of industry and firm effects in the biopharmaceutical industry. Research Policy 30(8): 1235-1251