This is more of a bookmark for myself and a student request.  I want to do a longer post on the relationships between income and happiness, or GDP and happiness in the future.  But for now I’ll just note these links:

http://en.wikipedia.org/wiki/Happiness_economics#Individual_income

http://www.newscientist.com/article/mg20727770.101-money-can-buy-you-happiness–up-to-a-point.html

http://blogs.wsj.com/wealth/2010/09/07/the-perfect-salary-for-happiness-75000-a-year/

The article itself (or one of them):

http://www.princeton.edu/~deaton/downloads/deaton_kahneman_high_income_improves_evaluation_August2010.pdf

Good analysis of the article and research:

http://www.nature.com/news/2010/060910/full/news.2010.447.html