> That 40T$s will never be repaid.

Yes, and? A while ago the UK government refinanced bonds from WW1, the South Sea Bubble, Napoleonic and Crimean wars:

* https://www.theguardian.com/business/blog/2014/oct/31/paying...

Has the UK really experienced any issues related to not ever paying back its debt? (IMHO, most of the UK's problems can probably be sourced back to Thatcherism and more recently Brexit.)

The only way for a country to repay its debt, versus refinancing it, is to run budget surpluses, which can work if done in a certain way, but most countries avoid for often good reasons:

* https://en.wikipedia.org/wiki/Austerity:_The_History_of_a_Da...

After reading her book, I can't take Lyn seriously.