In alignment with the question author's commentary refinement, "It would already be a nice and useful answer if there was -any- clue on -any- type of happiness.":
Stevenson, Betsey, and Justin Wolfers. "Subjective Well-Being and Income: Is There Any Evidence of Satiation?" American Economic Review 103.3 (2013): 598-604. Web.
Many scholars have argued that once “basic needs” have been met, higher income is no longer associated with higher in subjective well-being. We assess the validity of this claim in comparisons of both rich and poor countries, and also of rich and poor people within a country. Analyzing multiple datasets, multiple definitions of “basic needs” and multiple questions about well-being, we find no support for this claim. The relationship between well-being and income is roughly linear-log and does not diminish as incomes rise. If there is a satiation point, we are yet to reach it.
Summary of findings:
To preview, we find no evidence of a satiation point. The income–well-being link that one finds when examining only the poor, is similar to that found when examining only the rich. We show that this finding is robust across a variety of datasets, for various measures of subjective well-being, at various thresholds, and that it holds in roughly equal measure when making cross-national comparisons between rich and poor countries as when making comparisons between rich and poor people within a country.
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Abstract (reformatted for ease of reading)
Four replicable findings have emerged regarding the relation between income and subjective well-being (SWB):
Thus, more money may enhance SWB when it means avoiding poverty and living in a developed nation, but income appears to increase SWB little over the long-term when more of it is gained by well-off individuals whose material desires rise with their incomes. Several major theories are compatible with most existing findings:
- There are large correlations between the wealth of nations and the mean reports of SWB in them,
- There are mostly small correlations between income and SWB within nations, although these correlations appear to be larger in poor nations, and the risk of unhappiness is much higher for poor people,
- Economic growth in the last decades in most economically developed societies has been accompanied by little rise in SWB, and increases in individual income lead to variable outcomes, and
- People who prize material goals more than other values tend to be substantially less happy, unless they are rich.
We argue that the first explanation is a special case of the second one. A third explanation is relatively unresearched, the idea that societal norms for production and consumption are essential to understanding the SWB-income interface. In addition, it appears high SWB might increase people's chances for high income. We review the open issues relating income to SWB, and describe the research methods needed to provide improved data that will better illuminate the psychological processes relating money to SWB.
- The idea that income enhances SWB only insofar as it helps people meet their basic needs, and
- The idea that the relation between income and SWB depends on the amount of material desires that people's income allows them to fulfil.
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In spite of the substance in my answer (above), I maintain that the premise and question are poorly framed. Not unlike Neuro-linguistic programming (NLP), I firmly believe that a post-modernist philosophical approach is being employed by this line of research that flirts dangerously close to pseudo-science. While there is little doubting the potential for the sensational, I stand with those who venture that applying immature definitions, as well as, recursive and undeclared assumptions create an illusion of scientific maturity that simply does not exist. Further, the current approach (unintentionally?) advocates unsound scientific short-cuts that, at best, run the risk of gross misinterpretation by lay persons -- while at worst, subject the entire body of knowledge to endless premise challenges. There is very little in this thread of research that is meaningful or actionable outside a very narrow community -- and still, for them, most appropriately, only to conclude that more focus is needed. It can, after all, be considered an advance to get off the blank page and begin scratching away at the "we don't know what we don't know" knowledge boundary. I suppose through Dr. Steven Wright (Visiting scientist, Brain and Language Lab, Georgetown University), I can be more cogent (and diplomatic) on this point.
According to Dr. Steve Wright, it is important for researchers to level set their understanding of the meaning happiness before measuring happiness or interpreting statistics for actionable conclusions. He suggests that, currently, two high-level meanings of happiness have emerged. One is happiness as a transitory emotion, a feeling. He further suggests, there are researchers who seem to think this is all there is, and would define a happy life as nothing more than a tally of emotionally “up” or "down" snapshots. While the completely, separate and distinct alternative meaning has a stronger cognitive component (bias), involving memory and judgment (which introduces entirely different, if not equally subjective challenges to scientific measurement and replicability. Finally, Dr. Wright also suggests the integrity of subjects answers can (should?) be viewed through a lens of disbelief -- that is, 'is a respondent's answer true and accurate or skewed selectively and/or unintentionally?
Researchers have not yet come to an agreement about this dichotomy. They’re still quite a ways from being able to shed much light on most of the big questions. What’s really known scientifically advances slowly.
Disclaimer: With the exception of the final blockquote, I am not purporting to channel Dr. Wright. My representation of him is applied interpretation.