Lead users Von Hipple, why users produce by their own and why do they reveal their innovation: companies realize that they have benefits from exploiting users knowledge and in particular lead users knowledge, examples of this may be customers survey, software errors reporting and lead users method (Von Hipple). Lead users are users (common users are firms or individual consumers that expect to benefit from using a product or a service) with two characteristics: being ahead of normal users for their understanding of the product and having high benefits from a solution to the needs they have. Examples are surgeons for surgery tools, Cern for particular hardware and software development Agency costs, why lead users innovate: companies want to have access to the knowledge that the user developed, but when do users develop or modify products for their own use and when on the other hand they share their knowledge with the company? To understand this choice there is the model of the principal agent problem. The principal (users) and the agent (supplier), examples of agency costs: costs to monitor the agent, costs associated with an outcome that could not fulfill the requirement, potential hold up problem for unique needs (like a particular machinery). So, for instance, Cern needs a particular machine to do an experiment and has to decide whether to build it by itself or ask the market. So Cern has to evaluate all these possible costs related to the principal agent theory. If these costs are too high, the choice is hierarchy and not market. So, due to these costs, when users need a particular product with particular characteristics, often users innovate on their own. So they develop or modify products on their own because it is too costly to control the agent and they cannot trust the agent delivers the correct product. So users innovate for this or sometimes for enjoyment or learning. Then why do they sometimes disclose their knowledge to the company? The bottom line are Information asymmetries: between users and producers. Users’ innovations are functionally novel, they require user-need information and context of use information for their development. Producers innovations are improvements on well known needs and require an understanding of solution information for their development. So for companies, due to the information asymmetry, it is important to understand how to have access to this knowledge, so they need to know which incentives can induce lead users to disclose their innovation. Sometimes they reveal it freely because there are mutual benefits like other improvements or suggestions, or just for reputation. This have 3 implications: producers can seek innovations developed by lead users and this can be the base for a new profitable commercial product producers can provide toolkits for user innovation to draw them into joint design interactions users can become producers to diffuse their innovation (spin offs, users in a company using a capital good or designing a product and want to improve it, they exit a company and they do their own start up)