Banks and governments are closely connected. Banks often hold large quantities of their own government’s bonds because these securities are liquid, can be used as collateral, and are generally treated favorably under financial regulation. Governments, in turn, rely on banks to purchase public debt and provide credit to the domestic economy. Under normal conditions, this relationship supports financial stability. During a crisis, however, it can create a dangerous feedback loop.
The loop can begin with a deterioration in government finances. If investors become concerned about a sovereign’s ability to repay its debt, government bond prices fall and yields rise. Domestic banks holding those bonds then suffer losses, weakening their capital positions. As concerns about bank solvency increase, funding becomes more expensive and banks restrict lending. The resulting credit contraction reduces investment and consumption, weakening the broader economy.
Economic weakness then feeds back into the government’s finances. Lower output reduces tax revenue and increases demand for unemployment benefits and other public spending. If banks require recapitalization, guarantees, or deposit protection, the government may assume additional liabilities. Investors become even more concerned about the sovereign’s capacity to repay, pushing bond yields higher and causing further losses for the banking system. Problems on either side can therefore reinforce problems on the other.
This mechanism became especially visible during the euro-area sovereign debt crisis. National governments remained primarily responsible for rescuing domestic banks, but they could not independently issue currency or rely automatically on a national central bank to backstop their debt. Banks also held substantial amounts of their home governments’ bonds. Doubts about sovereign solvency and bank solvency consequently became intertwined, while fears of euro exit introduced the additional risk that assets and liabilities might be redenominated into a weaker national currency.
Breaking the doom loop requires reducing the dependence between banks and their home sovereigns. Stronger bank capital, more diversified sovereign-bond portfolios, common deposit insurance, and credible supranational fiscal backstops can all help. Central-bank intervention may also be necessary when rising yields reflect self-fulfilling panic rather than fundamental insolvency. The policy challenge is to provide enough protection to prevent systemic collapse without encouraging banks or governments to assume that all losses will ultimately be absorbed by someone else.
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