From the article, the intensity and duration of the pleasure decrease over time because when we get something, we want to get something else.
According to the article, everyone seeks happiness and also the maintenance of a good state of mind. This brings about new thoughts, new ideas, etc.
Therefore, the intensity and duration of the pleasure we take in new things tend to decrease over time. As humans, when we get something we want, we proceed to the next thing and want something else.
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