It is estimated that by 2030 the USA interest on their debt will exceed 100% of GDP.
The Fed is concerned that medical costs amount to nearly 20% of that cost.
It is not clear how medical costs relate to interest costs in their assessment.
But if the interest bill is greater than the countries income, the question is how sustainable is the interest costs.
At what point will the USA go the way of the UK pound and lose it's global currency status.
Also not mentioned is what % of costs are related to MIC, a huge budget item, that the Fed seems to gloss over or not even mention.
https://beincrypto.com/fed-chair-claims-us-debt-unsustainable-is-bitcoin-the-answer/