Introduction: Competitiveness might impact on adolescent well-being considering the social salience distinct from the other age groups. However, there is only sizable research on competitiveness and well-being. Also, most previous studies did not distinguish between individual-level and country-level competitiveness and lacked consideration of contextual effects such as country inequality.

Methods: Using cross-sectional data from the Program for International Student Assessment (PISA), we analyzed individual- and country-level competitiveness and its interaction with country inequality in relation to wellbeing (life satisfaction and purpose of life) in approximately 350,000 adolescents from 60 countries. Competitiveness and well-being were assessed via questionnaires. The Gini index retrieved from the World Bank was used for country inequality. A multilevel model was applied.

Results: Individual-level competitiveness was positively associated with both life satisfaction (beta = 0.087, 95%CI = 0.084 to 0.091) and purpose of life (beta = 0.214, 95%CI = 0.211 to 0.217), while country-level competitiveness was not. Although adolescents in the least unequal countries were satisfied with life the most and those in the most unequal countries reported the strongest purpose of life, there observed a nonlinear effect modification as a stronger association in middle unequal countries (p for interaction <0.05) compared to both less and more unequal countries.

Discussion: Individual-level competitiveness was positively associated with life satisfaction and purpose of life. The stronger association between competitiveness and well-being in middle unequal countries suggested that encouraging adolescents to compete within their activities or competition may work to mitigate the impact of country inequality.