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In behavioural economics, scarcity is a well known approach that drives engagement and desire in a product but can also lead to some “irrational” decisions by users. It is widely used in the business world in order to drive sales and in gaming as one of the fundamental methods in monetization. Scarcity can be applied in different forms in things like time, access, resources and others. With the introduction of scarcity, products may become more attractive and their perceived value increases, putting this way some sort of pressure, driving actions by users under the fear of missing an opportunity. When properly placed, scarcity can also create obsession and desire feelings, leading this way to engagement in <a href="https://hackernoon.com/tagged/mobile" target="_blank">mobile</a> apps.