The debate over presidential and parliamentary systems often assumes one is naturally more stable than the other.
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But much of that belief rests on selective evidence and oversimplified assumptions about how democracies actually function.
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Assuming this is true, we must ask, what is the true indicator of governmental stability?
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Well, that's a deep subject, isn't it?
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For decades, political scientists have told a familiar story.
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Presidential systems are inherently unstable.
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They produce rigidity, confrontation and winner take all politics that fracture fragile democracies.
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Parliamentary systems, we're told, are the safer option, flexible, adaptable and and cooperative.
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It's a neat narrative, simple and intuitively appealing.
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But what if its elegance has blinded us to a deeper truth?
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What if the case against presidentialism has been built on a narrow slice of global experience that doesn't hold up when we widen the lens?
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That's exactly what Donald L. Horowitz argues in comparing democratic systems.
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His thesis is not merely a defense of presidentialism.
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It's a challenge to how we think about democratic design, how we interpret evidence, how we diagnose instability, and how we assign blame.
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And his critique lands with force.
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The great debate over presidential versus parliamentary democracy, he argues, has been framed around the wrong question.
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The first problem he highlights is selection bias.
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Juan Linze's landmark critique, dropped draws heavily from Latin America, Brazil, Colombia, Venezuela, Chile, nations where presidentialism has indeed struggled.
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But Horowitz asks us to imagine swapping regions.
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What if Linz had started in post colonial Africa or South Asia?
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The narrative flips completely there.
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It wasn't presidentialism that doomed democracy.
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It was the parliamentary system.
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Specifically the rigid westminster model with its brutal winner take all features.
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Horowitz points to the work of Arthur Lewis, who argued that westminster parliamentarism was a major cause of democratic breakdown in English speaking Africa.
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In places like Nigeria, a single ethnic coalition could use a parliamentary majority to lock every other group out of power.
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And when a system enables exclusion, that total, the stage is set for coups, civil conflict or disintegration.
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Nigeria's descent into the:
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It happened under parliamentarism, under the exact system Lyn's praises.
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This leads to Horowitz's second insight.
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The problem isn't the executive structure.
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It's the electoral system that feeds it.
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Lynz describes presidentialism as producing rigid winners and marginalized losers.
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But that only happens under specific electoral rules, usually plurality voting or majority runoffs, where a candidate can win the presidency with 35% of the vote, yet claim a sweeping mandate.
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The real Culprit, Horowitz argues, is is not presidentialism, but the machinery of first past the post elections that manufacture artificial majorities.
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Once you modify the electoral folder, everything changes.
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Nigeria's Second Republic is the clearest example.
A president had to win not only a national plurality, but Also at least 25% of the vote in two thirds of the states.
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That rule forced every candidate to appeal across ethnic, religious and regional divides.
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It produced moderation, coalition building and centrist leadership, the exact qualities Lynz believed presidentialism could not deliver.
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Sri Lanka created a different model, a presidential system using preferential voting, where candidates compete for second and third choice support from minority groups.
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Here again, the goal was the same.
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To reward broad appeal and punish extremism.
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These countries didn't turn to presidentialism out of despair.
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They turned to it because parliamentarism had proven too exclusionary to manage deep divisions.
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Horowitz's third challenge to the conventional wisdom is his dismantling of the idea that parliamentary systems avoid zero sum politics.
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That assumption, he argues, is simply false.
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A parliamentary majority can be just as winner take all, and often more so than a presidential victory.
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In Westminster systems, a party with 40% of the vote can can sometimes capture 60% or more of the seats.
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Nothing prevents them from dominating the entire government.
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In presidential systems, by contrast, divided government is common.
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If one party controls the executive and another the legislature, the system automatically blocks winner take all outcomes.
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Gridlock may be frustrating, but it prevents domination.
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Then there's the claim that presidentialism encourages presidents to overestimate their power.
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Horowitz concedes the point, but only under plurality Elections Change the electoral formula and the illusion disappears.
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A president who must win broad regional support knows his mandate depends on cross group bargaining, not personal charisma.
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This leads to one of Horowitz's most important conclusions.
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Presidentialism and parliamentarism do not produce stable or unstable democracies on their own electoral design.
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How leaders are chosen matters far more than what system they inhabit.
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Rigidity not inherent.
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Many parliamentary systems complete their full terms.
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Flexibility not exclusive to parliamentarism.
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Presidential systems can change course through election cycles, cabinet reshuffles or legislative negotiation.
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Abuse of power.
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Neither system is immune.
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Both parliamentary and presidential states have produced autocrats, coups and constitutional breakdowns.
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Horowitz's final point is perhaps the most profound.
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The entire presidential parliamentary debate is a false tadotomy.
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The real divide is not executive form.
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It is winner take all politics versus inclusive institutional design.
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A parliamentary system with plurality elections can be dangerously exclusionary.
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A presidential system with distribution requirements can be remarkably conciliatory.
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Once you see this, the whole debate shifts from which system is best to a far more useful what rules will best reflect the divisions of society and turn competition into cooperation.
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In other words, stability isn't found in the structure of government, it's found in the incentives that structure creates.
