Strategy In auction bidding

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I was at an auction recently where three autograph signatures of Marilyn Monroe were up for auction, not as a single lot, but in three separate lots. The three lots were virtually identical, and all had the same opening bid amount ($1000). Assuming the number of interested bidders is unknown, but greater than three, what is the best bidding strategy for acquiring one of them at the lowest price?

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6
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No answer is possible without much more information. In particular, your objective is not well-defined, nor do we know the objectives of the other bidders.

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As Robert Israel points out, you'll need to specify the conditions. For example, let's say that all the other bidders have a maximum amount that they can bid per lot, and you know that the maximum among these is $B_{max}$. If you have unlimited money, and your goal is to acquire at least one of the lots at the "lowest price," then simply bid $B_{max}+2$ on the first two lots, then bid $B_{max}+1$ on the third lot. If this is not what you had in mind, then you should specify the conditions that you are thinking of.