From the article, separating reporting effects from the hedonic treadmill is tricky: It has been recognized that an individual’s assessment of their well‐being

From the article, separating reporting effects from the hedonic treadmill is tricky: It has been recognized that an individual’s assessment of their well‐being may reflect the social desirability of responses and Kahneman (1999) argues that people in good circumstances may be hedonically better off than people in worse circumstances, yet they may require more to declare themselves happy. In the context of the findings presented in this paper, women may now feel more comfortable being honest about their true happiness and have thus deflated their previously inflated responses. Or, as in Kahneman’s example, the increased opportunities available to women may have increased what women require to declare themselves happy.