"A million enel is a hundred million yen right?"
No you fucktard, its not. The prices will be vastly different based off the resources and technologies required and this will fluctuate based off the station and the system's availability of said resources. Theres no way to draw a line like we do on Earth were those factors have a constant fluctuation for more or less are already set (like resources of a type being depleted completely, the reason why gold price is always on the rise) and its possible to import and export more easily than from one solar system to another (which might even not have trade routes between themselves sometimes).