Scarcity Appeal:
1. Companies making limited editions of a product and letting the scarcity be known, such as making a limited amount of a certain Funko Pop, or making a certain amount of Phones in a certain color.

2. A returning fan favorite fast food items such as the McRib, or the Taco Bell Mexican-style Pizza.

This technique is used to inform the audience of the obscurity or rarity of an item so that it drives up sales. It activates FOMO (fear of missing out) in people and makes people react more irrational.

Cognitive Bias:
1. (Anchoring) Being told that you are expected to be 5’7 when you grow up, but you only become 5’5. This might be unsettling or annoying to the person that it was told to because they feel like they were cheated out of two inches.
2. (Confirmation) Only surrounding yourself with and befriending like-minded people with similar ideologies as you
Cognitive Biases play on your preexisting beliefs, so people use this to better “relate” with their audience or to make their audience believe that the speaker has and always will be on their side which leads to a more loyal following.