Basic Economic Design

Any MMO will have a currency its players use, right? However, many of you who have played these online games will have noticed that as you get situated and start accumulating money, it can't actually buy much from NPCs. The vast majority of money "spent" is when one player finds or makes a good item, then another buys from that player. However, in this process, the game money is not removed at all from the server.

Usually there are things to buy from NPCs, but they're typically items...

Basic Economic Design