Synergy Overstatement Bias
The empirical tendency for acquirers to overstate the run-rate cost and revenue synergies they expect from an acquisition. Academic studies of post-merger realization show ~70% of deals fall short of announced cost synergies and ~85% fall short of announced revenue synergies. The bias contaminates precedent-transaction multiples: deals priced on optimistic synergy projections inflate the precedent median for everyone who comes after, requiring a 25-40% haircut to back out to a roughly standalone-basis comp.
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Related terms
Ambiguity Aversion · Anchored Assumption · Asset Beta · Bank ROE Spread · Banker Pitch Deck · Beta
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