Political online game and economic simulation

In my country FSI, my economic growth rate went negative last quarter, but I’m not sure what caused it. I implemented the flat tax so that may have been it, but when I checked the data under economy comparing net income to expenses it seemed like my people were getting richer fast, which is why I’m confused as to why the growth went negative. In addition, my money supply is greater than gdp so that’s not it. If anyone can tell me what happened I would really appreciate an answer.

Occasional "spikes" in economic growth, both up- and downwards, are normal. They are not always tied to a task/reform/project/event, but can be a result of chance. However, it often can be observed that a sudden, strong increase (overheating) results in a cooldown shortly after. Flat Tax could be cause, but it does not have to be.

Your money supply is massive compared to GDP, and that can cause overheating.

the money supply looks good

Compared to the average state, it is 700 billion higher.