It allows people to sell their unwanted items. A good example would be Craigslist in the US which allows people to post classifieds online displaying the items they wish to sell.
Trading post settlements are early towns that act as trading centers. Small settlers would travel to these towns to trade furs and other goods, and purchase the supplies that they require.
The Sierra Trading Post is much like Amazon and Ebay, Except that it sell's clothing. It has brand names, as well as discount sales. This trading post will also sell stuff for around the home, and pets.
Try searching the Auctions, or Trading Post (Trading Post is better). But first you need enough Neopoints to actually buy one.
You can buy one from a shop, or the Trading Post.
Trading post/auctions
law
Rome began as a trading post
to have a place to trade w/ others && get the other items that were out around the world that they didnt know about until trading posts. that's whats up!
Cabanne's Trading Post was created in 1823.
Sierra Trading Post was created in 1986.
The population of Sierra Trading Post is 700.
Trading Post Perth Challenge was created in 1973.
Maisel's Indian Trading Post was created in 1939.
Navarre-Anderson Trading Post was created in 1789.
The most important trading post was Carthage.
Arkansas post
There are no "trading" posts in Pixie Hollow, but there is a post office where you can buy outfits, and send them to friends.