Seemingly positive disagreements often have normative origins

Define marginal cost. Is it different from the concept of willingness to accept?

What will be an ideal response?

In an open outcry Dutch auction, ________

A) the bidders begin the bidding process with a low starting bid B) the auctioneer begins the bidding process with a low starting bid C) the auctioneer begins the bidding process with a high starting bid D) the bidders decide the starting bid