Scholars long debated whether Richard Nixon’s 'Madman Theory' could enhance a leader's ability to coerce foreign adversaries. This study provides the first large-N test of this provocative idea.

Perception Measure: The author developed an original metric gauging how leaders were perceived as mentally unstable, drawing from news reports.

Analysis Scope: We examined impacts on both general deterrence and crisis bargaining scenarios.

Key Conditions Tested: Several hypotheses regarding when such perceptions might help or hinder diplomacy.

Our findings challenge the conventional wisdom: Rather than boosting coercion,

• Perceived Stability: The reputation for instability often undermined credibility in routine diplomacy, making threats less effective over time.
• Crisis Bargaining: This damage was particularly pronounced during high-stakes negotiations where trust is paramount.

Exceptional Cases: Perceived madness could be advantageous under certain conditions,

• such as when the leader's commitment to a position was genuinely uncertain, creating strategic ambiguity.

This nuanced result highlights that 'Madman' tactics carry substantial risks unless carefully calibrated. The findings underscore crucial limitations of reputational strategies in international relations.