Answer: The case of the number nine
Step-by-step explanation:
Studies have shown that the human brain prefers to buy things whose prices end with the number 9 as opposed to zero such as 10 or 100.
The brain apparently interprets the number 9 at the end of a price to mean that the person is saving money and getting better value by buying the product. In making all three prices end in nine, the electronics store is using this psychological pricing strategy.