научный факт от британских учоных ?

Журналисты в погоне за сенсацией переврали смысл.

http://businessjournal.gallup.com/content/150671/happiness-is-love-and-75k.aspx

After analyzing more than 450,000 GHWBI responses from 2008 and 2009, Dr. Deaton and Dr. Kahneman found that happiness is actually the result of the fulfillment of two abstract psychological states -- emotional wellbeing and life evaluation.

The difference between life evaluation and emotional wellbeing is vital, though the two are related. "Nobody claims that the two dimensions are independent," says Dr. Kahneman. "They're clearly distinct dimensions that are correlated. But they have somewhat different determinants. What improves people's emotional wellbeing is different from what it takes to make them say that they're satisfied with their life."

In other words, life evaluation and emotional wellbeing refer to different feelings. Life evaluation requires a long view of a person's overall life. Though life evaluation is colored by the day's emotions, Dr. Kahneman and Dr. Deaton's GHWBI research shows that people evaluate their lives based on a retrospective of their achievements. If they've accomplished the goals they've set, are financially secure, and are emotionally fulfilled, they're more likely to have a high evaluation of their life.

Emotional wellbeing reflects a much shorter view and refers to the emotional quality of an individual's everyday experience. If the day's experience is negative, emotional wellbeing will take a hit. That said, people with good emotional wellbeing seem to get it through social contact.

"Emotional happiness is primarily social," says Dr. Kahneman. "The very best thing that can happen to people is to spend time with other people they like.

More specifically, those with annual household incomes below $75,000 give lower responses to both life evaluation and emotional wellbeing questions. But people with an annual household income of more than $75,000 don't have commensurately higher levels of emotional wellbeing, even though their life evaluation rating continues to increase.

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То есть из двух компонентов счастья - эмоционального благополучия и жизненных достижений - один перестает расти на границе $75К и второй продолжает. Что происходит с суммой, когда одно из слагаемых константа, а второе возрастает ?