not necessariliy so. If they implement a logical structure
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Don´t kill me on the numbers, they are an example and need be balanced by FDev....
Every landable Planet represents a micro-market.
Installations there supply/get goods to a Hub located on that landable.
The Hub distributes to a Market (Port/Station).
Landable Body has a Port? 90% of goods go there.
Landable has a Station in Orbit? 90 % go there
Landable has both? Port get 90% Station gets 10%
Landable has neither Port nor Station in Orbit? Goods go to Station of regional Market
Regional Market has no Station? Goods go to Global Market - Biggest/Hightest Tier Station in System
As the Markets of each Port/Station are limited in No. of wares its can sell, on the Market appear the goods with the top supplies numbers.
This way you could influence your (different) Market spectrums by adding Ports/Stations to specific landables, taking their goods out of the main (global) Market and make them available as otherwise they might not be present because they don´t make the Top 30....
It also motivates players to structure their systems
@Paul_Crowther that should be a feasible approach as it fits to the parent/child structure you have in place already