While the G-SIB proposal frees up billions in capital, banks are expected to deploy it into higher-margin businesses. This means low-margin areas like the repo market will only see an incremental, not transformative, increase in balance sheet capacity.
While markets focus on the G-SIB and Basel III capital proposals, regulators are signaling that changes to liquidity rules are next. These future regulations could have a more significant impact on markets and the Fed's balance sheet than the current capital-focused reforms.
The G-SIB proposal aims to reduce year-end repo market volatility. However, the market has already proactively managed this risk by shifting activity into sponsor repo, lessening the overall effect of the regulatory changes, making them more modest than they appear on paper.
The Basel III Endgame proposal addresses risk-based capital. Since U.S. Treasuries already carry a 0% risk weight, the reform does not change banks' incentives to hold them. Any impact on swap spreads is expected to be a temporary, knee-jerk reaction rather than a structural shift.