Answer:
adaptation-level phenomenon.
Step-by-step explanation:
adaptation-level phenomenon defines human's tendency to quickly adapt / getting used to the new situations that we face in our life.
Most people generally think that becoming a successful movie star will bring satisfaction for the rest of our life. We imagine the life of those famous people to be glamorous and ideal.
But due to adaptation-level phenomenon, people who actually experience That type of life actually gets used to it quickly to the point where that life style become a 'new normal for them'. All the fame, money, and influence generally won't meant much to them since they are not something that is hard to get. This might explain why that celebrity only temporary surge of subjective well-being despite the huge success.