It seems like we have 3 different discussions here: How money is represented in-game (HoI 3) and how it was respresented irl and how it should be respresented in HoI 4. I have the impression that people are not reading eachothers posts and therefor fail to understand what the other is saying and stubbornly stick to their opinions.
I'm not going to pretend I'm an economist or that I have the least of understanding how it worked IRL. What I do know is that in HoI 3 money was so abstracted that even a 10 year old could understand. That being said, on the subject of 'money should be better respresented in-game', I agree. However, within the current time frame of the game (+- 10 years?), there is no way that you can simulate an accurate debt system without abstraction in one way or the other.
So the question is, and also the original question of this topic, how should money be simulated in HoI4? By keeping in mind the game mechanics and time frame of the game. Now, the mechanics are still subject to speculation, since we haven't had a DD about it yet.
That is why I preface my comments and relate it to the game. Money is important in the real world. But we don't need to argue about economic systems.
My whole point was that money is not important to the game since the game was limited to WW2. And during the war there is no historical proof that money was important. Before the war yes. After the war, sure. During the war, no way. Every country did whatever they could to win. Money was not a factor in any decision they made to win the war, outside of allowing their allies to run up debt so they wouldn't have to worry about resources.
And I could not think of a single way that you could make money important in the game. Especially since some countries really didn't care about paying for their stuff anyway.