Scarcity is a form of framing a product.
Example: At the Apple store, there’s only one of each product on display. All other inventory is in the back. This creates a sense of scarcity and increases the value of the product.
the brain is commonly regarded as a thinking machine, but it’s more often the opposite: a machine that tries to circumvent thinking. This is because cognition costs time and calories, which in our evolutionary history were scant resources.