Haley's parents bought her a used bicycle for her birthday. she was thrilled until she learned that her best friend received a brand new bicycle on her birthday. haley's declining satisfaction illustrates the

Haley is experiencing "relative deprivation".

Relative deprivation is a term in Sociology that describes a social status conflict within a person's head. They feel like they have been deprived of something that someone else has and they make a social decision to try and get it. It's almost like the old slang term, "Keeping up with the Jones'".