In today’s online world, everything seems to be permanently available in abundance. Snapchat has reintroduced scarcity into the entertainment sector. If you miss a story on Snapchat, which is only available for 24 hours, you will never see it again. This feature is definitely one part of the app that makes it so sticky, and persuades users to come back. Is there something in your product that can be made artificially scarce?
Source - DigitalPsychology.io