Text: Remember, there is no danger of the winner's curse if you are sure about the value of an item to you . In that situation, the auction device serves its proper purpose of putting the item in the hands of whoever values it the most.
Entailment: If you're confident in an item's value, you don't run any risk of  the winner's curse.
Contradiction: You definitely run the risk of running afoul of the winner's curse even if you're sure about an item's value.