https://fundooprofessor.wordpress.com/2015/12/28/hedonic-treadmill/
The hedonic treadmill, also known as hedonic adaptation, is the observed tendency of humans to
quickly return to a relatively stable level of happiness despite major positive or negative events or life
changes. According to this theory, as a person makes more money, expectations and desires rise in
tandem, which results in no permanent gain in happiness.