Central banks’ conflict of objectives: Why financial instability is inevitable
Our starting point is that central banks will have to keep in place very low long-term interest rates and negative real long-term interest rates, even if inflation remains quite high, for two reasons: To ensure public debt sustainability, given very high public debt ratios; To avoid a drastic downturn in asset prices; To enable the necessary investments in the energy transition, which have very long horizons and often low profitability. If real long-term interest rates remain negative for long, then financial instability will remain high: overindebtedness, abnormally high asset prices. But it is unclear how monetary policies could combat financial instability if they want to avoid a debt crisis or a collapse in asset prices and if they want to support the energy transition.