Simply needs repeating... When a guild disbands, do not make any trader they have available again, until next Sunday's hiring iteration. This:
-- eliminates the incentive for sleazy shadow guilds to lock down traders, and to try reselling them at a profit,
-- thus leaving more traders available for real guilds to hire, cutting out the middlemen.
-- reduces total trader prices by eliminating the parasite's profit.
-- increases guild and player satisfaction.
-- increases the supply of goods for sale, since the shadow guilds offer little/no inventory.
-- would be very easy to implement.
I don't claim it's a new idea. But if it makes sense to you, give me a +1 and let's remind ESO.
[Sigmund Freud's correct ideas mostly recapitulated ancient Greeks. But Freud still is famous legitimately, even just for his re-popularizing of things such as the subconscious and multiple parallel mental processes.]