Final Fantasy XII
This is from the Bazaar guide. It is very helpful to get these before starting to create things in the bazaar.
Interestingly, a small amount of Bazaar Goods requires no loot to be unlocked.
Requirements are indeed of another kind. Those Goods are also special because
they actually help you obtaining better loot from monsters in two ways :
1. They substantially increase the drop rate of rare loot
2. Monsters can drop more than one loot much more frequently
There's one downside, though : all monsters will also be able to drop a Pebble,
one of the less valuable loot (sold for 2 gil each).
They are called 'Monographs' (the shopkeeper in Jahara mentions them if you're
wondering whether they are correctly integrated in the world of Ivalice). They
are shown as "Forgotten Grimoire" in the Bazaar and, once bought, are listed in
the 'Key Item' part of the Inventory menu.
They are expensive, especially early on when money is hard to come by, but they
are well worth the price.
The Monographs and How to Get them
-> Hunter's Monograph (18000 gil)
Talk to Gastly in Muthru Bazaar after completing the 'Wolf in the Waste' hunt
Enables the acquisition of superior loot from beasts and avions
-> Knight's Monograph (19000 gil)
Talk to any weapon shop owner 30 times
Enables the acquisition of superior loot from giants and insects
-> Warmage's Monograph (20000 gil)
Read the 'Hunt board' 20 times
Enables the acquisition of superior loot from amorphs and undead
-> Mage's Monograph (21000 gil)
Talk to any magick shop owner 25 times
Enables the acquisition of superior loot from fiends
-> Dragoon's Monograph (22000 gil)
Read the 'Hunt board' 40 times
Enables the acquisition of superior loot from dragons and plants
-> Scholar's Monograph (22000 gil)
Talk to any armor shop owner 15 times
Enables the acquisition of superior loot from constructs
-> Sage's Monograph (25000 gil)
Talk to any shop owner/merchant 100 times
Enables the acquisition of superior loot from elementals
-> Canopic Jar (250,000 gil)
Sell PHOBOS GLAZE, HORAKHTY'S FLAME, and DEIMOS CLAY (all items earned by completing certain Hunts) to a merchant. (Or you can check the loot locations section of the site to find them)
Allows all enemies to drop Arcana
All numbers here are cumulative, you don't have to do it all at once. The game is smart enough to keep track of this.