Academic research on investing in investments and happiness:
- https://www.researchgate.net/profile/Greg-Davies-2/publication/257621998_Investor_Happiness/links/5afb5077aca272e7302c2e4d/Investor-Happiness.pdf
- https://www.aeaweb.org/articles?id=10.1257/jep.22.2.53#:~:text=Each%20doubling%20of%20income%20is,slightly%20stronger%20among%20rich%20countries
- https://onlinelibrary.wiley.com/doi/10.1002/9781118813454.ch9