Exploiting changes in countries’ competition laws, we find that competition increases firms’ propensity to use zero leverage (ZL). We test the financial-flexibility, financial-constraint, and quiet-life explanations for this result, concluding that desire for flexibility is the one most likely. The relation between competition and ZL strengthens with cash-flow volatility, which supports the flexibility motive. Adoption of ZL by firms is accompanied by increases in payouts, so it is unlikely that