INTRODUCTION
Co-creation — a collaboration between producers and users initiated by a firm to generate value for and with customers — has become a prominent feature in practice and in academic discussions. Co-creation enables companies to involve their users in innovation processes, develop valuable solutions for free or at a very lowcost, align theirstrategieswith customers’ needs, and thus become more competitive. With this principle in mind, a variety of companies ranging from big players, such as IBM, Procter & Gamble, Amazon, Dell, and Walt Disney, to small firms invest in co-creation with their customers, guide innovative user communities (IUCs), and develop the capabilities necessary to support these activities. However, a closer look at the co-creation boom reveals that one important aspect has been neglected — collaboration with non-customer groups, such as innovative bottom-up communities. Innovative bottom-up communities (IBCs) are those communities that develop innovative alternatives to products and services offered by companies, which,forsome reasons(e.g., a lack of supporting infrastructure, high costs, or remote locations), are not affordable for certain groups of people or do not respond to their needs. Therefore, in contrastto UICs in which customers are engaged in innovation co-creation focused on existing company products, IBCs are composed of non-customers who create innovative alternatives to a company’s products. These bottom-up initiatives take place around the world, and they often succeed in areas where traditional companies fail or find their efforts to be unprofitable. In addition,they often go beyond specific company target groups.