Government borrowing costs in several advanced economies hit their highest level since the 2008 financial crisis, or even earlier, on Monday as investors feared the Middle East crisis would keep inflation persistently high.
Concerns over rising prices and government spending pushed up the cost of debt issued by Paris, Berlin, Washington DC, Tokyo and London as investors fretted that rising prices would push up interest rates.
The yield, or interest rate, on 30-year French bonds rose to its highest level since September 2008 at 4.8558%, up one basis point (0.01 percentage point), LSEG data showed.
Because any borrowing done will be at a single rate that reflects overall European creditworthiness and will compete with German federal bonds for German creditworthiness.
If I’m an EU member and my borrowing rate is significantly lower than that of other members, I’d rather borrow any money myself. I’d rather borrow as a group with other parties that have comparable creditworthiness.
Afaik, there are however competing views of how to create a more backed low interest system on par with Northern European interest rates like the Blue Bond proposal ( see Bruegel or see this link).