I think, that you already for sure know about this moment during the game, but anyway... The idea of inventing "trading and investing" in game is very specific. From the first seen it seems like the system is made out to make you poor, but when you keep buying while the price is going down, finally it comes that it costs 1$/per one, and even with 1k$ in the pocket you can earn for about 100k$ with ease, which breaks all the interest in the game, when you starting to buy everything earlier than you should. Yeah, true fans of course can go hardcore mode and don't use it at all (I'm not sure, but maybe there's even one of 20 endings belongs to it), but anyway... The fact is that the system is broken, and probably the way to solve this problem, is to make the price not too dynamic, like make it possible to earn when you already have enough in your pocket. 

Anyway, that's just my opinion on the game, what I'd like to see as a player. And what about tge game at all, it's definitely 10/10, ty. (p.s. sorry for my bad English)