Shops and Local Prices

[The Arrogant]

So I was looking to instead of delivering cargo, delivering items between systems, seems like a good way to make money and then just grabbing a job from one system to another. I was just curious what types of items/item pictures correspond to what the local prices are. I was just curious because the local prices show on the map contain 4 types, and when you dock there are more than 4 types of items, some make sense, but others like food, I'm assuming is for general goods, but the ones with pill pictures(generally narcotics) do those belong to chemicals or general goods? I would assume chemicals right? there are a few others but I can't think of them right now

[The Arrogant]

I'm looking at beer for example, base price is 15, and in the sector I'm in it costs $14. Electronics, general goods, and energy are boosted in price, chemicals are reduced in price. does beer count as chemicals, or am I missing something? and stimm packs have a little pill symbol, and base price is 800, but they are going for 845 in the same system