>It's not a given that Millions of people have something useful to do.
It pretty much is guaranteed because that is how we structured our economic system. Why do think we have inflation? Inflation reduces the value of our assets and forces us to work just to stay where we are. It forces rich people to productively invest their assets. It forces poor people to spend their money as quickly as possible. This accelerates the economy an creates new jobs. Low un(der)employment is a policy goal of many governments and controlled inflation is a tool used to achieve that goal.
It pretty much is guaranteed because that is how we structured our economic system. Why do think we have inflation? Inflation reduces the value of our assets and forces us to work just to stay where we are. It forces rich people to productively invest their assets. It forces poor people to spend their money as quickly as possible. This accelerates the economy an creates new jobs. Low un(der)employment is a policy goal of many governments and controlled inflation is a tool used to achieve that goal.