Commodities diversity?

[FotonCat]

Which factors affect diversity of commodities (purple ones) available at stations?

1. Type of nearest planet?
2. Amount and diversity of planetary economics (B,G,T,E...) in current system?
3. Amount of production modules at station?
4. Anything else?
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   If several factors simultaneously, which factor has greatest impact on commodities diversity?
   
   [Edited on 3-14-2016 by FotonCat]

[Marvin]

If several factors simultaneously, which factor has greatest impact on commodities diversity?

Probably planetary economics and technology level (0-100).