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 most games, once a winner for one item is done, if there are more items to be bid upon, another auction is held for those items. The process repeats until a game condition is met or items are exhausted in the auction phase of the game. This is similar to Worker Placement, but workers can be kicked off spots by bidding higher.
In Power Grid, for example, you start with no power plants and must win bids to be able to produce power. Winning a bid on a given power plant allows that player to add it to their current inventory of power plants and also allows for more power to be made in a given turn. In Vegas Showdown, players bid on rooms. such as a slot machine or a restaurant, in order to build a larger hotel with more prestige and value. Winning players pay for the room based on their bid and place it in their hotel. In both examples, bidding is done in a turn format and players have the option of passing on bids.