It depends on various factors with environment being the most important one. For that matter, some research studies suggest that $75000 annual income in US might be an optimal income for family's happiness (which again is not a good representation of the environment we are in)
Reference: http://m.pnas.org/content/107/38/16489.full
Reference: http://m.pnas.org/content/107/38/16489.full
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