我正在做一个paper，其中涉及到一个问题，很难。不知大家有没有人知道。
有两个second price auctions。In the first auction，n bidders draw valuations from distribution of random variable X. In the other, bidders draw from Y. Valuations are affiliated. Now we know the expected difference between the first two order statistics of X is smaller than that of Y. The question is that under what conditions we can say that the winning bidder's expected profit is higher in the second auction.
当然如果是independent value auctions那么这个问题就很简单了。