Because Germany doesn't borrow massively to spend because it isn't allowed to. They have fiscal rules written in law which mean they can only issue a specific level of government debt. If they want to spend then they have to find the money from elsewhere.Still no idea why you talk about the 20th century.
Sticking to the 21st century, just explain for me why our national debt went massively up between 2010 and Covid, while Germany's fell by a similar amount.
The UK meanwhile has recorded budgetary deficits every single year for the last 25 years. Much of this deficit is financed by borrowing as opposed to taxes or savings they've found elsewhere.
10% of the UK government budget is now just debt interest. If we ran a fiscal debt rule similar to Germany and as a consequence held a similar level of debt to Germany then we'd free up around £50-60bn for public spending.
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