The Short Version
Cross-country data consistently show a clear positive association between GDP per capita and average national happiness. The World Happiness Report 2025 finds GDP per capita explains roughly 20–30% of between-country variance in life evaluations, and Our World in Data visualizations confirm a strong upward pattern. While GDP is not the sole or dominant driver — social support, freedom, and other factors also matter — this does not support the claim that "no strong correlation" exists. The claim overstates the weakness of a well-documented relationship.