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For finding innovative ideas or elaborating on re-use of waste possibilities, it is good to work on your own to some extend but in others it would be preferable to look for peers or organisations engaged along the value chain.
An example for such a joint initiative is the Lab of Tomorrow e.g. which offers on a project base new entrepreneurs exchange with peers and supporting experts applying the Design Thinking approach. The starting point of each lab is a development challenge, the commercial potential of which is identified in the course of several months of user-centric research and then ideas and sustainable business models are developed together in so-called "innovation sprints" within the framework of interactive workshops.
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You have decided to run a start-up that will sell shorts made from classis jeans and appeal to potential clients with the idea of circular economy and recycling. What you want to do is to stock in second hand shops. You need to decide how are you going to do it. You have only a limited financial resources and need to think carefully where and how to invest money in the beginning.