That helps, thank you. But here's a follow-up question. Let's say I want to auction the 'rebate' component of a bid; from a buy-side, the higher the rebate the more competitive the bid. Could I then either create a forward auction with rebate being the line item or an index auction with discount percentage and have index set to 100? Would both auctions operate in the same way? Would there be any differences in set-up? Or in what the sell-side views?
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