Ann: First Revenues from Sol Telecom in Brazil, page-55

Maybe some one trying to jump the que hoping to make sure he/she's out highest price as possible before the end of auction.
All depends on what the closing bids and sells are. Lowest seller sells into the highest bidders price.
I think that's what happens I've done before, but you can come unstuck if the bidders are not there at the higher price. Don't take my word for for gospel but I think that's how it works.
You can always check it out research and it online.