Platforms are designed one interaction at a time. Thus, the design of every platform should start with the design of the core interaction that it enables between producers and consumers. The core interaction is the single most important form of activity that takes place on a platform—the exchange of value that attracts most users to the platform in the first place. The core interaction involves three key components: the participants, the value unit, and the filter. All three must be clearly identified and carefully designed to make the core interaction as easy, attractive, and valuable to
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