Explanation

Under the Basel III framework, Common Equity Tier 1 (CET1) capital is the highest quality capital and includes:

• Common shares
• Stock surplus (share premium)
• Retained earnings
• Other comprehensive income
• Regulatory adjustments

Defined benefit pension fund liabilities would increase CET1 capital because:

1. When a bank has a defined benefit pension plan, the net pension asset or liability is recorded on the balance sheet
2. If there is an increase in pension liabilities due to actuarial losses or other factors, this creates a corresponding increase in the pension liability
3. Under Basel III, certain pension fund adjustments are included in the calculation of CET1 capital
4. An increase in pension liabilities would typically result in a corresponding adjustment that increases CET1 capital

However, it's important to note that this is a complex area and the actual impact depends on the specific accounting treatment and regulatory adjustments applied to pension liabilities under Basel III. The relationship between pension liabilities and CET1 capital involves various regulatory filters and adjustments that banks must apply.

This question tests understanding of how different balance sheet items affect regulatory capital calculations under the Basel framework.