The FCC will have to generate $88,379,558,704 in bids — after bidding credits and discounts — during the likely months-long process to cover the $86.4 billion in promised broadcasters in the reverse auction, plus the almost $2 billion for broadcasters moving expenses following the auction and the cost of administrating the auction itself.
Source: $8.5B Bid in Opening Round of Forward Sectrum Auction | Multichannel