You make two strong arguments about why the value of money is based on people's belief in it's value. And then you just ignore them. As you said, if people do

You make two strong arguments about why the value of money is based on people's belief in it's value. And then you just ignore them. As you said, if people don't believe the government will enforce it, it has less value. As you clearly say, it doesn't matter what the government says, it matters what people believe. And it hyper inflation or matters what people believe future value is. You should rethink your definition of money because you've essentially demonstrated its value derives from belief.