The Financial Times reported an annual interest bill of more than $2 trillion for OECD governments. The operational question behind that figure is who will buy the debt governments need to issue, and at what yield.
Central banks, banks, insurers, pension funds and other institutional investors have long been significant buyers. Their demand changes while financing needs remain substantial. The price at which a government can refinance matters alongside its outstanding debt.
Repayment and refinancing costs
Consider a deliberately simplified example: a government needs to refinance €100bn. At 3%, demand is sufficient to absorb the issue. If some buyers reduce their purchases, the same amount may require a yield of 3.5%, 4% or more.
The government may still be able to repay its debt. The increase in the cost of replacement funding nevertheless changes its budget over time. Higher yields increase interest expense as outstanding bonds mature. Interest expense increases the deficit, which can require further borrowing. New issues then need to attract investors.
This process can produce a gradual deterioration in the budget equation. It does not require a sudden default event.
The French case
French debt sustainability is often discussed in terms of a debt-to-GDP threshold. Refinancing dynamics require additional questions:
- Who buys French government bonds?
- How much new debt must the market absorb?
- What yield premium do investors require over German Bunds?
- How does the average cost of the outstanding stock change when older bonds mature and are replaced at current yields?
- When does increasing interest expense constrain the budget enough to change perceptions of French risk?
These questions concern the path of funding costs and the ability to maintain demand across successive issues.
Consequences for insurers
For institutional investors, including insurers, the implications include the yield curve, sovereign spreads, bond valuations, reinvestment yields, asset-liability management, asset allocation and solvency.
Persistently higher yields make the government’s funding equation more difficult. They can also increase the income available on new long-term investments. The outcome for an insurer depends on its existing assets, liability profile, liquidity needs and reinvestment horizon.
Monitoring sovereign debt therefore includes both repayment risk and the progressive cost of persuading investors to keep funding it.