The second study replicated these findings with 600 participants recruited through the online platform Prolific. This time, neuroticism was measured using the Big Five Inventory—a validated eight-item scale that's far more reliable than two questions. Same result: neuroticism predicted liberalism only in Americans younger than 54.

Both studies controlled for gender, income, education, and ethnicity. The age-neuroticism-ideology link held across all demographics.

THE INTERNATIONAL TEST

Here's where it gets interesting. If this were simply about aging—if young neurotics everywhere lean left—you'd expect to find the same pattern globally. You don't.

The third study examined 23,368 participants from 20 countries spanning Europe, Asia, Africa, and South America through the World Values Survey. Across all these countries, there was no consistent interaction between age and neuroticism in predicting political ideology.

This is the study's most compelling finding. It suggests the American pattern isn't biological or developmental. It's contextual. Something about the contemporary United States—rising inequality, educational debt averaging $30,000 per graduate, labor market instability—is creating both mental distress and political realignment among the young.

WHAT IT DOESN'T PROVE

Rigoli is appropriately cautious about causation. These are correlational studies. We can't definitively say that neuroticism causes young people to become liberal. The arrow might point the other direction: perhaps holding liberal views in an increasingly polarized America generates anxiety. Or perhaps a third factor—say, economic precarity—causes both neuroticism and leftward politics.

"The next step is to investigate empirically why neuroticism is linked with ideology among young, but not old Americans," Rigoli notes. "Is it because young Americans have grown up in a more competitive age, as hypothesized in the paper? This remains to be explored empirically."

There's also the question of what we mean by "liberal" in a seven-point self-assessment scale. American political ideology is multidimensional—you can be economically progressive but socially conservative, or vice versa. The study doesn't parse these distinctions.

WHY IT MATTERS

Setting aside the obvious political flashpoints this research might trigger, there's a deeper story here about how economic structures shape psychology, and how psychology shapes politics.

Rates of anxiety and depression have surged among young Americans over the past two decades. If Rigoli's hypothesis holds, this isn't just a public health crisis—it's a political one. The same forces making young people anxious may be pushing them toward ideologies that promise relief from that anxiety.

"These findings encourage people to reflect on the benefits and costs of living in a competitive society like the American one," Rigoli observes. "It invites readers to reflect on how competition may affect people's mental wellbeing, and in turn on how this may have implications for politics."

The universe doesn't care what we believe. But apparently, the economy we build might shape what we believe more than we'd like to admit.

The study, "Neuroticism Is Linked With Liberal Ideology in Young, but not Old, People in the United States," was authored by Francesco Rigoli and published in the International Social Science Journal.