Rare Book Monthly

Articles - April - 2014 Issue

How to Get Current Price Estimates from Older Auction Records


Actual prices and current estimates for the ultra-expensive first edition of Audubon's Birds of America (click to enlarge).

Here is a feature that will help subscribers to the AE Bibliographic Database (or future subscribers) get a better handle on values. The AE Database is a compilation of records, mostly priced auction lots, from the field of books and works on paper. It is now over 5 million records strong, and growing almost every day or two. It is unique.


When you do a search of the AED, you will see a button at the top left, just above the results, that reads “Get Current Estimate.” To get a current estimate, either check those records for which you seek one, or check the box at the top that will check them all. Then click the button. Your current estimates will appear. What, then, is a “current estimate?”


A “current estimate” is a guideline for what older auction prices represent in value in today's dollars. It is not just an indexing for inflation, adjusting yesterday's prices based on the consumer price index or the price of milk. Instead, it adjusts old prices based on the rate of inflation (or deflation) in the price of books over time. That is where the 5 million database records come in. They have been used to compute median prices for years as far back as 1914. That has enabled us to calculate something of a consumer price index for books, rather than groceries or housing or some other unrelated commodity.


Now this is going to be an estimate, as perfection is not possible. It will take an old price and calculate an estimate based on the appreciation of a typical book, but not all books are equal. Just as all elements of the consumer price index have not appreciated at equal amounts, so have books appreciated at different rates. In general, the old adage that “the rich get richer” is true of books too. The most valuable books generally appreciate more than average. Books by authors once in greater favor than they are today may appreciate more slowly, if at all. If more recent auction prices are higher than estimates for older ones, that is a sign of above average appreciation. That book may also be an above average investment going forward. One where recent sales are below estimates from older sales may indicate a book losing favor. You may want to be more cautious in what you pay for a book in this category than one appreciating faster than average.


The Get Current Estimate feature also translates prices in other currencies to U.S. dollars so all records can be compared. Conversions are made using exchange rates at the time of sale (not current exchange rates) for accuracy in estimates.


Here are two more numbers you will see when you get a current estimate:


1. Average Current Estimate. This computes the average current estimate of all the records you have selected. For this to provide a reasonable estimate, you need to make sure you have only selected apples, not oranges. In other words, if you get the estimate for a particular title, but it includes a mix of first and later editions, some signed copies, etc., though each individual estimate will be reasonable, averaging them together will not. You need to select only comparable copies and eliminate the rest to get a solid average estimate.


2. Probability of Reappearance. Here is another useful feature, but as with average current estimate above, you need to select only comparable records. This formula looks at how often the book has shown up at auction in the past and computes roughly how often it can be expected to show up in the future. The formula is weighted to more recent results as books which may have shown up frequently a half or even a century ago may have mostly disappeared from the market today. This can be very helpful in determining whether to buy a copy of a book. If it appears at auction every year or two, or maybe multiple times per year, there is little need to chase a copy that is more than fully priced. If it is a book you seriously want, but it appears rarely on the market, perhaps only once every five, ten or more years, you may want to be more aggressive in your pursuit of a copy now being offered. You may have to wait a long time for another chance.


Those of you who are already using this feature may have noticed current estimates rose recently. The median price of books rose 7% last year, so older prices have had their current estimates raised by this amount to reflect the recent upward trend in prices. However, they have not yet caught up with prices prior to the recession of 2008. You will still find current estimates lower than actual prices paid during the years 2004-2007, with the largest drop being from prices in 2007, the year before the big recession.

Rare Book Monthly

  • <b>Forum Auctions: Fine Books, Manuscripts and Works on Paper. March 22, 2018</b>
    <b>Forum Auctions, Mar. 22:</b> Jenner (Rev. George Charles). <i>The Evidence at Large...Respecting Dr Jenner's Discovery of Vaccine Inoculation,</i> presentation copy from Edward Jenner to Rev. Rowland Hill, 1805. £4,000 to £6,000
    <b>Forum Auctions, Mar. 22:</b> Houdini (Harry).- Maggi (Girolamo). <i>De tintinnabulis liber postumus...de equuleo liber,</i> Harry Houdini's copy, Amsterdam, H. Wetstein, 1689. £600 to £800
    <b>Forum Auctions, Mar. 22:</b> Meyer (Henry Leonard). Coloured Illustrations of British Birds, and their Eggs , 7 vol. in 2 plus Illustrations of British Birds, 4 vol., 1842-50 and [1835-51]. £5,000 to £7,000
    <b>Forum Auctions: Fine Books, Manuscripts and Works on Paper. March 22, 2018</b>
    <b>Forum Auctions, Mar. 22:</b> Dickens (Charles). <i>An Entirely New Romantic Drama, in Three Acts, by Mr. Wilkie Collins, called The Frozen Deep,</i> 1857. £3,000 to £4,000
    <b>Forum Auctions, Mar. 22:</b> Lighthouses and Islands of Ireland, c. 125 drawings, 1867. £6,000 to £8,000
    <b>Forum Auctions, Mar. 22:</b> Shelley (Lady Jane). Diary, 1853 & 1860. £1,500 to £2,000
    <b>Forum Auctions: Fine Books, Manuscripts and Works on Paper. March 22, 2018</b>
    <b>Forum Auctions, Mar. 22:</b> Scottish Binding.- The Holy Bible, Containing the Old and New Testaments, bound in contemporary brown polished calf decorated with the figure of a Chinese spearman, by ?James Scott of Edinburgh, 1778. £2,000 to £3,000
    <b>Forum Auctions, Mar. 22:</b> Greene (Graham). <i>The Man Within,</i> first edition, signed by the author, 1929. £4,000 to £6,000
    <b>Forum Auctions, Mar. 22:</b> Mellan (Claude, 1598-1688). The Holy Face, or the Veil of St Veronica, [c. 1649 and later]. £800 to £1,200
    <b>Forum Auctions: Fine Books, Manuscripts and Works on Paper. March 22, 2018</b>
    <b>Forum Auctions, Mar. 22:</b> Desaguliers (John Theophilus). <i>A Dissertation concerning Electricity,</i> W. Innys, and T. Longman, 1742. £2,000 to £3,000
    <b>Forum Auctions, Mar. 22:</b> Le Jeune (Paul). <i>Relation de se qui s'est passé en la Nouvelle France en l'anné 1636 enuoyée au R.Pere Provincial de la Compagnie de Iesus en la Province de France,</i> 1637. £2,000 to £3,000
    <b>Forum Auctions, Mar. 22:</b> Stumpf (Johann Rudolph). <i>Gemeiner loblicher Eydgnoschafft Stetten, Landen und Völckern Chronicwirdiger thaaten beschreibung, </i> Zurich, Froschauer, 1586. £3,000 to £4,000
  • <b>Swann Auction Galleries Mar 22: Autographs</b>
    <b>Swann Auction Galleries Mar 22:</b> George Washington, Letter Signed to General James Clinton, preparing for the Sullivan-Clinton Campaign, 1778. $25,000 to $35,000.
    <b>Swann Auction Galleries Mar 22:</b> Thomas Jefferson, Letter Signed, to Major-General Nathanael Greene, promising to send reinforcements against Cornwallis, 1781. $15,000 to $25,000.
    <b>Swann Auction Galleries Mar 22:</b> Thomas Edison, Autograph Letter Signed, to Western Union President William Orton, 1878. $10,000 to $20,000.
    <b>Swann Auction Galleries Mar 22: Autographs</b>
    <b>Swann Auction Galleries Mar 22:</b> William, Bishop of Coventry, vellum charter granting the church of Rochdale to the Cistercian Abbey of Stanlaw, in Latin, 1222. $3,500 to $5,000.
    <b>Swann Auction Galleries Mar 22:</b> FDR, Photograph Signed & Inscribed, framed with wood removed from the White House roof, 1927. $2,500 to $3,500.
    <b>Swann Auction Galleries Mar 22:</b> Jean Dubuffet, archive including many letters written while painting in NYC, 1951-72. $4,000 to $6,000.
    <b>Swann Auction Galleries Mar 22: Autographs</b>
    <b>Swann Auction Galleries Mar 22:</b> Mohandas K. Gandhi, Autograph Letter Signed, describing the source of his patience, 1939. $4,000 to $6,000.
    <b>Swann Auction Galleries Mar 22:</b> Lithograph portrait of Albert Einstein by Hermann Struck, signed by both, 1923. $4,000 to $6,000.
    <b>Swann Auction Galleries Mar 22:</b> Charles The Bold, Duke of Burgundy, Letter Signed to Johann IV of Nassau, in French, 1470. $3,000 to $4,000.
    <b>Swann Auction Galleries Mar 22: Autographs</b>
    <b>Swann Auction Galleries Mar 22:</b> Jean Cocteau, Autograph Letter Signed, in French, 1919. $3,000 to $4,000.
    <b>Swann Auction Galleries Mar 22:</b> Louis Armstrong, two Autograph Letters Signed to Erich Kauffmann, his lip salve purveyor, 1965-70. $1,500 to $2,500.
    <b>Swann Auction Galleries Mar 22:</b> Wernher von Braun, Autograph Letter Signed to Jonathan Cross, 1975. $5,000 to $7,500.
  • <b>Bonhams: Fine Books and Manuscripts. March 9, 2018</b>
    <b>Bonhams, Mar. 9:</b> BEETHOVEN, LUDWIG VAN. Autograph Manuscript sketch-leaf part of the score of the Scottish Songs, "Sunset" Op. 108 no 2. [Vienna, February 1818]. Inscribed by Alexander Wheelock Thayer. $80,000 to $120,000
    <b>Bonhams, Mar. 9:</b> Violin belonging to Albert Einstein, presented to him by Oscar H. Steger, 1933. $100,000 to $150,000
    <b>Bonhams, Mar. 9:</b> EINSTEIN, ALBERT. Autograph Letter Signed ("Papa") to his son Hans Albert, discussing his involvement with the atomic bomb, September 2, 1945. $100,000 to $150,000
    <b>Bonhams: Fine Books and Manuscripts. March 9, 2018</b>
    <b>Bonhams, Mar. 9:</b> HAMILTON, ALEXANDER. Autograph Letter Signed, to Baron von Steuben, with extensive notes of Von Steuben's aide Benjamin Walker, June 12, 1780. $10,000 to $15,000
    <b>Bonhams, Mar. 9:</b> NEWTON, ISAAC. Autograph Manuscript in Latin, being detailed instructions on making the philosopher's stone. 8 pp. 1790s. $200,000 to 300,000
    <b>Bonhams, Mar. 9:</b> 1869 Inauguration Bible of President Ulysses S. Grant. $80,000 to $120,000
  • <b>19th Century Shop:</b> Charles Darwin on sexuality and the transmission of hereditary characteristics: Autograph Letter Signed to Lawson Tait. Down, 17 January [1877].
    <b>19th Century Shop:</b> MILTON, JOHN. <i>Paradise Lost. A Poem written in ten books.</i> London: 1667. A very rare example with the contemporary binding untouched and with a 1667 title page.
    <b>19th Century Shop:</b> Hamilton secures the ratification of the Constitution: <i>The Debates and Proceedings of the Convention of the State of New-York, assembled at Poughkeespsie, on the 17th June, 1788.</i>
    <b>19th Century Shop:</b> The social contract “Man is born free, and everywhere he is in chains”: ROUSSEAU, JEAN-JACQUES. <i>Principes du Droit Politique [Du Contract Social]</i>. Amsterdam: Michel Rey, 1762
    <b>19th Century Shop:</b> “The first English textbook on geometrical land-measurement and surveying”: BENESE, RICHARD. <i>This Boke Sheweth the Maner of Measurynge All Maner of Lande…</i>

Article Search

Archived Articles

Ask Questions