You can "gamesell" items for a little money. While items can be sold to other players (if you have a License to Commerce), it is sometimes quicker and easier to just "sell the item to the game".
For new players especially, selling items in this way is the quickest way to make money.
When you gamesell an item, if someone has a higher offer in the Seller's Market, the item will be sold to that player, and you'll receive the price they were offering.
50% of all gamesold items are put into the Refuse Store or Grocery Store (depending on whether or not the item was a food; the rest of the gamesold items are gone forever). Items in the Refuse Store and Grocery Store remain there for a few days, and are sold for much higher than their gamesell value.