Not fundamentally broken, but there are a lot of issues. One of them is the investors are not humanly possible. The news doesn't seem actually reflect anything. The upgrades you buy with those books are insanely useless. There's a lot of simple things that can be done to fix that. It seems the game's economy as a whole isn't at all balanced. Also, if you get a repeat trader you get stars, but no where could I find out how to use those stars. A waste of 75 gems.