A bid plus is used in case of an absentee bid tie. It raises your bid by one or two bid increments. Say there are two sealed bids in on an item for $1000. If there are no + bids entered on either bid, the bid with the earliest date submitted would be the winning bid. If one individual had a +1, the item would be hammered to them at $1100, or plus one bid increment. If you would like any additional clarification on the Bid Plus please do not hesitate to contact us.