Speaking of auctions;
I frequent an auction site. Once you make a bid it is binding. You cannot withdraw the bid because that is in the terms of the rules of the auction. Unless you are outbid your offer to purchase is going to be the winning bid. As I said, it's all in how everything is written.
Then we have these to "compatible" (?) Sections from the Restatement (Second) of Contracts Chapter 3 Formation of Contracts - Mutual Assent
Sec 41. An offeree's power of acceptance is terminated at the time specified in the offer, or if no time is specified, at the end of a reasonable period of time.
Sec. 42 An offeree's power of acceptance is terminated when the offeree receives from the offeror a manifestation of an intention not to enter into the proposed contract.