New research explores how birth order influences voter turnout, a factor previously overlooked in political participation studies.

Using unique population-wide register data from Sweden and Norway, the study finds that higher birth order correlates with lower turnout rates.

This effect appears consistent across four non-Nordic countries as well.

Key Findings:

• Lower voter turnout increases significantly with later birth order;
• The difference in turnout between first-borns and younger siblings is more pronounced at low-turnout levels;
• This pattern emerges despite variations in family structures and socioeconomic backgrounds.

Mechanism:

The effect seems to be partly mediated by:

• Socio-economic position;
• Attitudinal predispositions toward political engagement.

This nuanced understanding of how family dynamics shape political behavior expands the conceptual frameworks for analyzing electoral participation.