On page 44 it is stated: However, over supplying demand (where the good stops being “green,” and demand drops to 0) can lead to negative BGS consequences, so only fulfil the station’s needs, and no further. For example, a small station might have three green bars, but only wants 250 t of goods. Supplying 750 t will eliminate demand and turn the three green bars into red empty bars and hurt BGS.
The guide does not explain HOW trading past demand "hurts" the BGS, leading to confusion for some commanders.
