Does Antimatter Really Matter
62.5 trillion dollars a gram is the price of antimatter, and owners tend to be governments, or possibly aliens, if you believe in them, they say.
One kilo of antimatter is worth more than all of China, if China were purchased at today at todays retail market price.
So saying China is richer than the US is like saying the US doesn't have a big stash of anti matter.
https://science-to-go.com/antimatter-most-expensive-substance-on-earth/