When a product or service is limited in availability, then it becomes more attractive to shoppers. When they understand that it’s limited in availability and that others also desire it, it creates a fear of missing out, which in turn persuades the shoppers to act fast.
Human psychology makes us prone to purchase items when we know that they are the last ones, or when a special offer on them will expire soon.
It is advised to add scarcity triggers in the product description, at the top of the product page, near the main CTA buttons.