Interestingly when austerity was being pushed in the early 2010’s one driver was the claim that having more than 90% debt / gdp ratio would cause a country to go into recession.

Turns out though the report this claim was based on had an Excel error in its formula which when corrected would have shown an ~2% growth. Amazing how such a small error can have a such huge implications.

Hannah Fry had an episode about it on the BBC. https://www.bbc.co.uk/sounds/play/m001r1s4