This can be set equal to the highest bid made, or equal to the second highest bid overall (ie the bid made by the next highest bidder, it can be the same person and bid twice or more, up to perhaps the price direct purchase).
The prices of the works from the price lists of the exhibitions or auctions of the last ten years of the artist are taken into account!
The price at auction of a project is constantly increasing, and each prospective bidder must always bid more than the previous one. The same person has the right to make several "strokes" even for the same project.