The notion of 'industry', defined as all firms that produce close substitutes (Porter, 1980), has served us well. What it did is to focus our attention on competition and more specifically on the importance of value appropriation as well as capability development (Barney, 1991; Teece, Pisano, & Shuen, 1997) for firms as these compete in an industry. Recent developments made us recognize the importance of complementarity, that is that the value of a combination of products and services exceeds the value of products and services when taken separately (Brandenburger & Nalebuff, 1996, 2021). This has various consequences for our conceptualization of the relevant environment for firms. Taking complementarity into account, firm performance is not...