FEATHER

No recipe in Java 26.2 produces it: it drops from chickens and parrots. Neither of those birds needs a fight, so the supply side of this trade is about as easy as trading ever gets.

The buying side is the part that takes work. A Fletcher only wants feathers at expert, the last of the five levels a villager can reach in that job, so the trade is not available at all until that whole climb is finished. Easy item, slow route to sell it.

One villager, one price, and it takes the whole climb to reach it. A Fletcher at expert pays an emerald per 24 feathers, the only offer for this item anywhere in the game.

The best rate any villager offers is an emerald per 24 feathers, from the Fletcher, and 2 of the other 4 pay out faster. No villager sells feather back, so it is emeralds out and nothing in.

One slot at the Fletcher takes 24 feathers a trade, 16 trades, 16 emeralds. 8 of the 72 villagers that pay emeralds, emptied out:

16 acacia boats against 416 flint for the same 16 emeralds, 26 times the carrying, and the shortest wait is the Shepherd at 10 real minutes of shelf, gathering not counted. Feather itself pays 24 an emerald, so 62 of the 72 ask less and 6 ask more.

Feathers sit at level 4 of five, the top rung, which means every lower tier a Fletcher passes through on the way there sells other things and never this. Reaching expert is a prerequisite, not an option.

Once unlocked, the slot allows 16 sales before it needs a restock, on the same schedule every profession runs on. Nothing about the top tier changes how that limit works, it is just later to arrive at.

16 sales close this slot, and the wait for a fresh batch is 2 real minutes, same as any other trade. A Minecraft day spans 20 real minutes and covers two of those restocks.

A full day at that Fletcher clears 768 feathers for 32 emeralds, and reaching expert in the first place is the only part of that math that takes real effort.

Do not wait to start collecting. Chickens and parrots are already dropping feathers long before any Fletcher reaches expert, so a stockpile can sit ready and be sold the moment the trade actually unlocks.

Where the emeralds go back: the same expert Fletcher also sells arrows, 16 for 1 emerald, so feathers sold in can turn straight into arrows bought back out.

Also on the Fletcher's list: enchanted bow, tripwire hook, enchanted crossbow, tipped arrow, stick, flint.

Every arrow needs a feather, and only chickens supply them, so an arrow farm is really a chicken farm with extra steps. Chickens breed on any seed, which makes them the cheapest animal to keep in numbers.

Feathers are otherwise nearly useless, which is exactly why the Fletcher buying them is such a clean trade: you sell something you cannot spend and keep the eggs and the meat. A dropped egg hatches a chick often enough to run a farm on eggs alone.

A feather and an ink sac give a quill for a book, which is the only writing tool in the game. Feathers also go into a firework star as the fade element in some recipes, and into nothing else at all.

Chickens drop them when they die and never otherwise, so unlike eggs the supply needs the animal killed. A chicken farm that cooks its own birds produces feathers and food from the same loop.

Feather Falling has nothing to do with them, despite the name, which is worth saying because people look for the connection.

A chicken drops up to 2 Feathers, which makes the Fletcher's 24 Feathers per emerald 12 chickens at least. An auto chicken cooker breeds them from their own eggs and sends the Feathers down the same hopper as the meat: How to Make an Auto Chicken Cooker in Minecraft.