A part of something you can never quit, It’s all in your head, every part of it. Just thinking of it is the hidden cost So if you’ve solved this riddle, you have lost.

I rise and fall with hopes and fears, I shift with time, through months and years. I can make you rich or leave you poor, I’m fueled by numbers, but I’m never sure.

You think it's helping, but it's all in your head. A mere thought, maybe even pretend. Even if it's hard you say it isn't, then my effect comes into play, becoming present.

I'm neither right nor 'cute. I'll never change my mind or opinion

I’m a word with extras, though they don’t speak, The start is bold, the rest is meek. Strip them away, my form’s still true, A silent line, and that’s my clue.