A major risk factor in financial stability governance is the Bank-Sovereign Nexus—the tight financial connection between a country’s commercial banking network and its domestic government.
The Doom Loop Transmission Cascade
This interdependence can create a dangerous feedback loop, known as the Doom Loop, during a sovereign debt crisis:
[Sovereign Credit Rating Drops] 
           |
           v
[Domestic Government Bonds Devalue] --------> Wipes out commercial bank capital reserves
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           v
[Banks Restrict Lending & Credit Supply] ---> Slows real economic growth and tax revenues
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           v
[State Fiscal Deficit Expands Rapidly] -----> Worsens the sovereign credit crisis

Because commercial banks hold large portfolios of domestic government bonds, any drop in sovereign credit ratings reduces the value of bank assets, hurting capital adequacy ratios and forcing banks to restrict credit. This slowdown impacts real economic growth, reducing tax revenues and worsening the state’s fiscal deficit, which deepens the sovereign credit crisis.
 
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