The Scarcity Effect

People will feel pressured to make a decision (e.g., to purchase an item, or sign up to a trial), if they believe that there is a limited supply, or a limited time to act.

For example:

• "Only 4 remaining"
• "Only 3 days left to redeem this offer"

Conversion rates

• A limited supply (of more or less anything) can incentivise people to convert (make a purchase).

Purchases

Sharing & referrals

• People may be more incentivised to invite their friends, if they believe that the supply is limited.
• "It's now or never".