Answer: An increase in equity volatility

## Explanation A steeper credit spread curve means that the difference between long-term and short-term credit spreads increases. **Option A**: An increase in equity volatility typically leads to a steeper credit spread curve because: - Higher volatility increases uncertainty about future credit conditions - Investors demand higher compensation for long-term credit risk - Short-term spreads may not increase as much due to immediate liquidity and market conditions **Option B**: An improved overall economic climate would typically flatten the credit spread curve as economic uncertainty decreases across all time horizons. **Option C**: The issuance of fewer long-term bonds with the same rating would likely flatten the curve due to supply-demand dynamics (less supply of long-term bonds could reduce long-term spreads). Therefore, increased equity volatility is most likely to result in a steeper credit spread curve.

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