English to Lithuanian Bus/Financial Business/Commerce (general)

How would you translate "complementary bidding" also known as "cover bidding" or "courtesy bidding)?

Definition: Complementary bidding, also known as cover bidding or courtesy bidding, occurs where some of the bidders agree to submit bids that are intended not to be successful, so that another conspirator can win the contract. For example, the cover bids might contain prices that are uncompetitive in relation to the prices submitted by the conspirator who is designated to win the contract, or alternatively, the cover bids might contain conditions that the conspirators know will be unacceptable to the agency calling for the bids.