Bidding box for home-played games. Use of bidding boxes has several advantages over oral bidding: it reduces noise in the room, prevents bidding being overheard at neighboring tables, allows easier review of the auction, and reduces the opportunity to pass unauthorized information to one's partner (intentionally or not) by the manner and intonation in which one makes one's bid. A bidding box is typically a plastic box with two slots, each containing a set of bidding cards. One slot contains 35 cards with symbols of bids (5 denominations—clubs (), diamonds (), hearts (), spades (), and notrump (NT)—in seven levels of bidding,
Reverse auction expires. The buyer with the highest offer wins the right to purchase the item for the price determined at the end of the auction. A reverse auction is different in that a single buyer offers a contract out for bidding (by either using specialized software or through an on-line marketplace). Multiple sellers are then able to offer bids on the contract. As the auction progresses, the price decreases as sellers compete to offer lower bids than their competitors whilst still meeting all of the specifications of the original contract. Bidding performed in real-time via the Internet results in a dynamic,