The same artist’s work can cost $3,000, $8,000, and $15,000 without any of those numbers being fraudulent. The objects may differ in size, medium, date, series, complexity, uniqueness, edition, condition, signature, provenance, exhibition history, or frame. The channels may also differ: artist or gallery primary market, resale listing, auction estimate, hammer price, or dealer inventory. Fees and seller motivation change the transaction further. First label each number as an asking price, reported sale, estimate, or total including fees. Then compare only reasonably similar works. Unexplained inconsistency deserves a question; visible difference does not by itself prove mispricing. Comparability must be demonstrated, not assumed from the artist’s name alone.
Normalize the object
Create one row per work with title, date, medium, dimensions, image area, uniqueness or edition, signature, condition, frame, provenance, and location. Compare works within the same medium and period before crossing categories. A small work on paper, large painting, and unique sculpture are not a clean ladder simply because the artist made all three.
Size can matter, but price per square inch is only a rough diagnostic. It ignores material, labor, complexity, series importance, minimum production cost, and the fact that pricing does not scale perfectly.
Normalize the price type
A gallery’s current offer and a reseller’s listing are asking prices. An auction estimate is a pre-sale range. A hammer price is the accepted bid before some buyer charges. A buyer’s all-in price includes premium and perhaps tax or other fees. A private ‘sold’ label may not disclose the transaction amount.
Do not place those numbers in one column called ‘market value.’ The Guide to comparing prices provides a source-aware worksheet.
Account for time and channel
Artists’ primary prices may change as bodies of work, representation, costs, and demand develop. Older inventory can retain an earlier price; a benefit sale or studio archive release may follow specific terms. A resale owner may ask above or below current primary-market pricing for personal reasons.
Gallery and artist-direct channels provide different services but should not be reduced to an assumed commission. Auction results may reflect urgency, condition, provenance, bidding competition, and available buyers on one date.
Look for a coherent explanation
Sources
- The Art Basel and UBS Global Art Market Report 2026Art Basel and UBS / Arts Economics
- Understanding Auction FeesChristie's
- Guide for BuyersSotheby’s
- Publication 561: Determining the Value of Donated PropertyInternal Revenue Service
