France is on track to spend €75 billion on debt interest by 2027—more than its entire education or defense budget. Unlike the US, France can't print euros to inflate away debt, raising the risk of a serious fiscal crisis in the eurozone's second-largest economy.

If France hits the wall, the European Central Bank will face massive pressure to intervene. Any bailout would likely involve large-scale money creation, spreading inflation across the entire eurozone. Every euro holder would effectively subsidize France's spending problem.