2 - 4 Players
This mechanic requires you to place a bid, usually monetary, on items in an auction of goods in order to enhance your position in the game. These goods allow players future actions or improve a position. The auction consists of taking turns placing bids on a given item until one winner is established, allowing the winner to take control of the item being bid on. Usually there is a game rule that helps drop the price of the items being bid on if no players are interested in the item at its current price.
In-game money is bet on different commodities in hope that that particular commodity will become the most valuable as the game progresses. Often the values of the commodities are continually changing throughout the game, and the players buy and sell the commodities to make money off of their investment.