Explanation

This question deals with the impact of collateral on credit exposure and volatility between remargining periods.

Key Points:

• Current exposure: Collateral reduces current exposure because it provides security against potential losses
• Volatility between remargining periods: When correlation is zero between the exposure and collateral, the combined position volatility is calculated as: $$\sigma_{combined} = \sqrt{\sigma_{exposure}^2 + \sigma_{collateral}^2}$$ Given:
  • Exposure volatility = 6%
  • Collateral volatility = 8%
  • Correlation = 0
  $$\sigma_{combined} = \sqrt{6^2 + 8^2} = \sqrt{36 + 64} = \sqrt{100} = 10\%$$

Analysis:

1. Current exposure: Collateral decreases current exposure because it provides security
2. Volatility: The combined volatility (10%) is higher than the individual volatilities (6% and 8%), so volatility increases between remargining periods
3. Correlation effect: Zero correlation means the assets move independently, leading to diversification benefits being limited

Conclusion:

• Collateral decreases current exposure ✓
• Volatility increases between remargining periods ✓

Therefore, option B is correct: "The presence of collateral decreases the current exposure, but increases the volatility of the exposure between remargining periods."