An economy system is in place to help facilitate exchanges between players, and the game world. The in game currency, coins, may be used to purchase items from spawn, and can be earned by selling things back to spawn, or through special events.You can check to see how much coins you have at anytime by sending "/econ" (without the quotes) as chat message. Players may also create shops similar to those appearing at spawn to buy and sell things. Simply put a chest down, populate it with contents you want to sell, and create the sign as shown at spawn.

Various shops are scattered across spawn. Shop signs allow you to either buy, or sell from them. Right click on buy signs to buy the listed item; left click on sell signs to sell listed item.

Examples:

Admin Shop
   1
  B 75
 Bread
This sign means it will cost you 75 coins to buy 1 bread. More on the coins will be explained in the economy section.
Admin Shop
   64
 3200 S
Iron Ingot

This sign means it will buy 64 iron ingots from you for 3200 coins. If you do not have a full stack, it will pay you for what you have.

Your Shops

It is possible to make your own shops. Simply follow this pattern and put a chest immediately below the sign to create a shop:

YourIGN
Quantity
B Price : Price S
Item
For example:
huang_a
   1
 B 100
 Bread
If I fill a chest with bread, each bread will be sold at 100 coins each. Similarly, for example:
huang_a
   1
 75 S
 Bread
I will be purchasing bread from other people at 75 coins each. Finally:
huang_a
   1
B 100 : 75 S
 Bread
I will be purchasing bread at 75 coins each, and selling them at 100 coins each.