Editing Intelligence quotient (section)

===Income===
<!-- This whole section needs to be checked against the sources for missing information and undue weight -->
<!--
{| class="wikitable"
|-
|+ '''Relation between IQ and earnings in the U.S.'''
! IQ || <75 || 75–90 || 90–110 || 110–125 || >125
|-
| Age 18 || 2,000 || 5,000 || 8,000 || 8,000 || 21,000
|-
| Age 26 || 3,000 || 10,000 || 16,000 || 20,000 || 42,000
|-
| Age 32 || 5,000 || 12,400 || 20,000 || 27,000 || 48,000
|-
| colspan="6" | Values are the average earnings (1993 US Dollars) of each IQ sub-population.<ref> {{cite journal | last1 = Murray | first1 = C | year = 1997 | title = IQ and economic success | journal = Public Interest | volume = 128 | pages = 21–35}}</ref>
|}
-->

It has been suggested that "in economic terms it appears that the IQ score measures something with decreasing marginal value" and it "is important to have enough of it, but having lots and lots does not buy you that much".{{sfn |Detterman|Daniel|1989}}<ref>
{{cite web
 |url=http://www.americanscientist.org/template/AssetDetail/assetid/24538/page/4
 |title=The Role of Intelligence in Modern Society (July–Aug, 1995)
 |pages=4 (Nonlinearities in Intelligence)
 |date=July 1995
 |first=Earl B. |last=Hunt
 |publisher=American Scientist
|archive-url=https://web.archive.org/web/20060521185816/http://www.americanscientist.org/template/AssetDetail/assetid/24538/page/4 |archive-date=21 May 2006}}</ref>

The link from IQ to wealth is much less strong than that from IQ to job performance. Some studies indicate that IQ is unrelated to net worth.<ref>{{Cite news |work=The Times |location=London |title=Brains don't make you rich IQ study finds |first=Mark |last=Henderson |date=25 April 2007 |url=http://www.timesonline.co.uk/tol/news/uk/science/article1701377.ece |archive-url=https://web.archive.org/web/20080906215126/http://www.timesonline.co.uk/tol/news/uk/science/article1701377.ece |url-status=dead |archive-date=6 September 2008 |access-date=5 May 2010}}</ref><ref>{{cite web |title=You Don't Have To Be Smart To Be Rich, Study Finds |website=ScienceDaily |url=https://www.sciencedaily.com/releases/2007/04/070424204519.htm |access-date=26 August 2014}}</ref> The American Psychological Association's 1995 report ''[[Intelligence: Knowns and Unknowns]]'' stated that IQ scores accounted for about a quarter of the social status variance and one-sixth of the income variance. Statistical controls for parental SES eliminate about a quarter of this predictive power. Psychometric intelligence appears as only one of a great many factors that influence social outcomes.{{sfn|Neisser et al.|1995}} [[Charles Murray (political scientist)|Charles Murray]] (1998) showed a more substantial effect of IQ on income independent of family background.{{sfn|Murray|1998|p={{Page needed|date=January 2011}}}} In a meta-analysis, Strenze (2006) reviewed much of the literature and estimated the correlation between IQ and income to be about 0.23.<ref name="Strenze2007">{{cite journal |last1=Strenze |first1=Tarmo |date=September 2007 |title=Intelligence and socioeconomic success: A meta-analytic review of longitudinal research |journal=Intelligence |volume=35 |issue=5 |pages=401–426 |doi=10.1016/j.intell.2006.09.004 |quote=The correlation with income is considerably lower, perhaps even disappointingly low, being about the average of the previous meta-analytic estimates (.15 by Bowles et al., 2001; and .27 by Ng et al., 2005). But...other predictors, studied in this paper, are not doing any better in predicting income, which demonstrates that financial success is difficult to predict by any variable. This assertion is further corroborated by the meta-analysis of Ng et al. (2005) where the best predictor of salary was educational level with a correlation of only .29. It should also be noted that the correlation of .23 is about the size of the average meta-analytic result in psychology(Hemphill, 2003) and cannot, therefore, be treated as insignificant.}}</ref>

Some studies assert that IQ only accounts for (explains) a sixth of the variation in income because many studies are based on young adults, many of whom have not yet reached their peak earning capacity, or even their education. On pg 568 of ''[[The g Factor: The Science of Mental Ability|The g Factor]]'', [[Arthur Jensen]] says that although the correlation between IQ and income averages a moderate 0.4 (one-sixth or 16% of the variance), the relationship increases with age, and peaks at middle age when people have reached their maximum career potential. In the book, ''A Question of Intelligence'', [[Daniel Seligman]] cites an IQ income correlation of 0.5 (25% of the variance).

A 2002 study further examined the impact of non-IQ factors on income and concluded that an individual's location, inherited wealth, race, and schooling are more important as factors in determining income than IQ.<ref>{{cite journal |last1=Bowles |first1=Samuel |last2=Gintis |first2=Herbert |year=2002 |title=The Inheritance of Inequality |journal=Journal of Economic Perspectives |volume=16 |issue=3 |pages=3–30 |doi=10.1257/089533002760278686 |doi-access=free}}</ref>