The chart from Gallup shows the relationship between GDP per Capita and Life Satisfaction (i.e. happiness). As can be seen there is a strong correlation between GDP per capita and happiness of a population. Please note that the X-axis uses a logarithmic scales so the impact of GDP per Capita on happiness is even more dramatic than chart conveys.
If your goal is to improve life satisfaction of a society, increasing GDP per Capita must be a key component of your plan.
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