If you're not earning as much as you'd like, it might be time to slap on a big smile.
The first in-depth investigation into whether happy children go on to be more successful has shown that those with a positive upbringing take home more cash.
The research carried out at the University of Warwick in America, analysed data from 15,000 young adults and adolescents, finding that those who reported higher 'life satisfaction' grow up to earn a higher income in later life.
They found that happy people were more likely to get a degree, find work, and get promoted quicker than their more miserable colleagues.
A one point increase on the life satisfaction scale (a technical science measure for happiness) at 22 meant almost $2,000 in higher earnings by the age of 29.
The researchers also looked closely at siblings and found that even those growing up in the same household – the cheerier child went on to earn more.
The results mean that being optimistic may be a self-fulfilling prophecy.
Author Dr De Neve explained, "Perhaps most importantly, for the general public - and parents in particular - these findings show that the emotional well-being of children and adolescents is key to their future success, yet another reason to ensure we create emotionally healthy home environments."
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