引用自 Attention Seeker：

I don't know what is happening, when I decrease taxes it just decreases growth but sometimes it increases and vise versa

Well, you see, if you raise taxes then that leaves your people with less money, resulting in a downturn in economy,the reason it comes up again is meaning your economy is back to normal, but if you experience recessions and stagnation, this is a normal thing in economy, it will get better.