Answer:
Stimulus generalization
Step-by-step explanation:
When a conditioned stimulus evokes a similar conditioned response, this situation is called stimulus generalization.
For example, a child has been conditioned fear a rat then similar objects like toy rats also causes the child to be afraid.
Here, the expensive national brand's have distinct packaging. They evoke certain feelings from the customers. The other brands also start packing in a similar way in the hopes to evoke the same feelings.
Hence, this is an example of stimulus generalization.