Quote Originally Posted by BLZrizz View Post
The exact market price at any specific time is hard to peg, but the upper boundary is easier to figure out. I define the upper boundary as the lowest sell offer price that remains on the market longer than 12 hours. For example, a player offers at $6.50 per, and the offer remains open for 12 hours. $6.50 is the upper boundary price. The actual market rate can be much lower than this, but it cannot be higher.

Right now a sell offer is open at $5/per, and it has been over 12 hours. So the implied market rate is below $5, and likely somewhere in the 4's right now.
This presumes that threads get closed when all is sold, takes no account for the quantity for sale, and leaves market manipulation completely out of the question. Someone selling 20 million at $5/mil, has little impact on the market, and may leave their post unedited for days after all has been sold.