Answer:
hedonic treadmill
Step-by-step explanation:
Hedonic treadmill: The term "hedonic treadmill" is also referred to as "hedonic adaptation", and is described as an observed human propensity of quickly returning back to a relative or comparatively stable level of happiness irrespective of major negative or positive life changes or events. The term was initially described by two psychologists named Campbell and Brickman during 1971.
In the question above, the given statement is a classic example of the hedonic treadmill.