Ceteris paribus, "all other things being equal," isolates variables by assuming constancy elsewhere, a method from logic and economics. In poetry, this phrase appears when speakers imagine counterfactual scenarios, when attempting to isolate particular causes or consequences. Poets employ it when reasoning through hypotheticals, when trying to understand what would change if one factor alone varied. The phrase suggests analytical thinking applied to emotional or existential questions, the attempt to bring systematic reasoning to life's messiness. It appears in poems of speculation and regret, where speakers wonder how different choices might have led to different outcomes, using this formula to imagine alternative histories while recognizing that nothing else ever truly remains equal.

Ceteris paribus—all other things being equal—is fundamental to scientific method and economic reasoning, allowing isolation of variables by assuming everything else remains constant. The phrase rarely applies to lived experience, where multiple factors always interact. Poets use ceteris paribus when reasoning through counterfactuals, imagining how different choices might have produced different outcomes. The phrase suggests analytical thinking applied to emotional or existential questions, bringing systematic reasoning to life's messiness. Related to regret, speculation, and the roads-not-taken. Useful for understanding poems that explore alternative histories, that wonder what would have changed if one factor alone had been different. The phrase also appears in poems questioning whether rational analysis can capture human experience, whether we can ever truly hold all else equal, whether the ceteris paribus assumption enables useful thought experiments or merely produces false clarity about irreducible complexity.