Central bank independence faces its biggest stress test so far this century

Central bank independence is facing an unusually severe test because high public debt, supply-driven inflation and political pressure are converging to weaken the institutional safeguards that support price stability.

• Since the 1970s, operationally independent central banks have become a global norm, but this consensus was supported by three decades in which inflation was generally not a dominant public concern.
• G7 government debt-to-GDP ratios are now at levels unseen outside wartime and are expected to keep rising under current policies, while higher borrowing costs and slower growth increase the fiscal effort needed to reduce debt ratios.
• Fiscal dominance becomes more likely when governments pressure central banks to keep rates low or use their balance sheets to finance spending; the average maturity of government debt has fallen across most G7 countries, especially in the US.
• Inflation has increasingly come from supply bottlenecks linked to geopolitical conflict, climate events and health emergencies, making interest-rate policy less able to deliver a painless landing because higher rates cannot restore missing goods.
• Political pressure is visible in the US, Japan, the UK, Canada and France: President Trump has attacked the Federal Reserve, Japanese leaders have urged the Bank of Japan to hold down yields, and a leading French presidential candidate has proposed cancelling roughly 18% of French public debt held by the Eurosystem.

Takeaway: Investors should treat central bank independence as a crucial institutional protection rather than a permanent feature of governance, because its erosion could unanchor inflation expectations, raise bond yields and risk premiums, increase borrowing costs and impose a larger economic cost to restore price stability.