Polarization curbs investment by 2.2 percent across seven nations
A study from Banco de España tracking seven democracies shows political polarization has surged since 2009, rising twice as fast in North America as in Europe. The research finds that higher polarization and legislative gridlock reduce real capital investment by up to 2.2 percent.
Diverging trajectories across the Atlantic
Researchers at Banco de España constructed high-frequency monthly indices tracking reported political polarization and legislative gridlock across seven advanced economies from 1995 to 2025.
The data reveal a broad surge in polarization following the 2008 financial crisis, with North American measures quadrupling by 2025 while European indicators increased between 1.5-fold and three-fold.
Across the pooled sample, the polarization index climbed from a base of 100 to 237.2 in the 2023–2025 period.
Econometric local projections demonstrate tangible economic consequences: a one standard deviation increase in polarization reduces real gross capital formation by 2.2 percent over twelve quarters, while a similar shock to gridlock lowers investment by 1.5 percent.
Electoral cycles and institutional shock absorbers
The analysis demonstrates that ideological polarization and legislative deadlock operate through distinct channels.
While polarization increases by an average of 22.6 points around national elections, gridlock shows no regular electoral reaction.
Furthermore, unified government control lowers the gridlock index by 16.4 points and significantly dampens the pass-through from polarization to institutional paralysis.
In Italy, electoral rules favoring governing majorities decoupled the two metrics, containing legislative obstruction despite rising partisan division.
Noise versus paralysis
Separating political rhetoric from functional paralysis is an essential empirical breakthrough.
Markets routinely conflate toxic public debates with actual legislative deadlock, misjudging fiscal risks.
Institutional design matters more for policy delivery than the volume of partisan conflict.
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