中文摘要：

针对拍卖中存在的跳跃投标现象，且跳跃投标对可能改变拍卖双方期望收益情况，以基于跳跃出价的两物品增价拍卖为例，研究了跳跃出价对投标方收益效应，计算了跳跃出价均衡下的投标方期望收益，并在同不存在跳跃出价进行比较的基础上，给出了投标方希望通过跳跃出价改善其期望收益的一般条件。

英文摘要：

Aiming at the phenomenon of jump bidding in multi-unit auctions which may change the expec- ted revenue of auctioneer and bidders, the paper studies effect of revenue of two-unit auction based on jump bidding. We calculate the expected revenue of bidder under the jump bidding equilibrium and compare it with that under non-jump bidding. The general condition under which bidders can use the tool to improve their expected revenues is given.