Here is what Ivigrowth wrote about the way to bid:<br/><br/><em>The auction itself was handled by a portly man who was known only as the Auction Master.  Behind him, a large computer screen recorded current bids.  To bid, an owner lifted a paddle with the number of the slave he wanted to bid on.   All slaves were bid on at the same time, often making for a chaotic situation. </em><br/><br/>So I guess that interested buyers who are ready to bidding have just to post a message with the number of the slave they want to buy, and maybe describe the new price displayed on the screen above the stage.<br/><br/>I would say that bids go by steps of 10 $ (or whatever currency this is).