Mine is that since the US is turning more and and more into a scam economy, the problem then becomes that they’ll eventually run out of other people’s money.
The Soviet Union on the other hand had a near unsolvable fossil fuel issue crippling their economy.
I sure am glad I have the freedom to hunt through several arcane websites search functions to find a doctor that’s i think looks good based off no information other than that they have an MD and practice primary care, only to book an appointment for 6 months later, at which point they cancel my appointment because they realize that my plan is slightly different than they thought.