Trading

NPC encounters can happen for trading,^[1] which enables trading without going to a Marketplace or another player.^[2] This also implies central exchanges for marketplace and player trading.

These NPCs will ask for currency such as Emerald, Ruby, and Sapphire.^[3] For this reason, players should always be accumulating items, as NPCs can at any time come asking for items that could be in your inventory.^[4] The logic is infallible.