Rare Book Monthly

Articles - August - 2007 Issue

AE Services Part 3: Current Price Estimator

Avest

AE Price Estimator shows upward value trend for a Gutenberg Bible leaf.


By Michael Stillman

This month we look at one of the Americana Exchange's most useful tools, its current price estimator. It updates values of prices in the 1.6 million-plus AE Database (AED) of book records to their current estimated value. It helps you make sense out of old priced records, those which go back as far as 1914. This tool comes with all subscriptions to the AED, which contains over 1.6 million book records from auctions, catalogues, and bibliographies, most of which include prices.

Here is how it works. The AE price estimator takes a price from any given year and updates it to 2007 values, based on typical increases in book values since that year. For example, the average book value has increased fivefold since 1980, fifty times since 1936. So, the current price estimator will take a book that sold for $2 at auction in 1936 and provide a current estimate of around $100. If a book has sold multiple times since 1914, it will provide a current estimate for each year's price, and even average out all of those estimates for a cumulative current estimate for all sales combined.

How accurate is this? We certainly would not claim these are definitive values. The rate of increase is based on what we have seen across the broad spectrum of records within the AED. Therefore, they represent the overall trend in pricing. However, not every book has appreciated at the average rate. In general, the rarest and most historically important texts have appreciated at an above average rate. On the other hand, some fiction and poetry that was popular years ago, but has since fallen out of favor, has stagnated while the world around it rushed forward. What these numbers most clearly do is convert the price the book sold for years ago into today's book dollars. On average, that is the same as current value, but can vary for individual items.

Fortunately, most books appear in the AED multiple times, providing several looks at its value. The averaging feature is very helpful here. Also, looking at price trends based on current estimates is very useful for understanding value. If more recent sales translate to higher current estimates than older ones, this is a good sign that the book is appreciating at a higher than normal rate. It may be a better investment than a book trending in the other direction. Naturally, more recent sales are likely to provide estimates closer to current value than ones from the distant past. Nevertheless, this tool will place even those oldest records into sufficient context to be meaningful.

Obtaining pricing data is one of the most difficult challenges for sellers and buyers alike, yet it is undoubtedly the most important item of practical information each needs. Few collectors can afford to seriously overpay, while sellers don't want to undercharge or price so high they cannot sell. Many people look to online listing sites such as Abebooks for pricing information. The problem with this is that Abe values are asking prices, not selling ones. Often, someone will post a price pulled out of thin air, and then others will follow like lemmings with similar figures. Those books can stay unsold seemingly forever, all sellers locked in to the first posted, unrealistic price. In other situations, prices for similar items can be all over the place, one seller wanting $10, another $100. What is this book worth? Who knows? None of these represent actual sales, and it is not clear which, if any, prices were posted by knowledgeable sellers versus rank amateurs.

Rare Book Monthly

  • <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>
  • <b>Bonhams: Exploration and Travel, Featuring Americana, Part I. September 25, 2018</b>
    <b>Bonhams, Sep. 25:</b> Shackleton, Ernest. <i>Aurora Australis.</i> Printed at the sign of 'The Penguins'; East Antarctica, 1908. $70,000 to $100,000
    <b>Bonhams, Sep. 25:</b> Shackleton, Ernest. <i>South Polar Times.</i> 1st edition, limited issue. from the library of Michael Barne. $20,000 to $30,000
    <b>Bonhams, Sep. 25:</b> General Washington's <i>Proceedings of a General Court Martial... of Major General Lee.</i> Philiadelphia, 1778. 100 copies printed for Congress. BOUND WITH: ...Court Martial... of St Clair and ...Schuyler. $25,000 to $35,000
    <b>Bonhams: Exploration and Travel, Featuring Americana, Part I. September 25, 2018</b>
    <b>Bonhams, Sep. 25:</b> <i>The Voice of the People.</i> Boston, 1754. Rare pamphlet on the Excise Tax. Nathaniel Sparhawk's copy. $4,000 to $6,000
    <b>Bonhams, Sep. 25:</b> Autograph Letter Signed ("S.L. Clemens"), offering extensive hard-earned advice on writing, 5 pp, 1881. $30,000 to $50,000
    <b>Bonhams, Sep. 25:</b> After Fra Egnazio Danti. <i>L'Ultime Parti not:e nel Indie Occid:ntli" [The last known parts of the Western Indies].</i> Painted Map of California, Western Mexico, and Japan. $70,000 to $100,000
    <b>Bonhams: Exploration and Travel, Featuring Americana, Part I. September 25, 2018</b>
    <b>Bonhams, Sep. 25:</b> Ptolemaeus, Claudius. <i>Geographie opus nouissima...</i> 1513. The most important edition of Ptolemy, containing the Admiral's Map. $250,000 to $350,000
    <b>Bonhams, Sep. 25:</b> De Arellano, Don Alonso. Manuscript, his <i>"Relación mui singular y circunstanciada... Capitán del Patax San Lucas,"</i> manuscript copy from the Sir Thomas Phillips collection. $50,000 to $80,000
    <b>Bonhams, Sep. 25:</b> Purchas, Samuel. <i>Purchas his Pilgrimes.</i> First edition. With John Simth's engraved map of Virginia. $70,000 to $100,000
    <b>Bonhams: Exploration and Travel, Featuring Americana, Part I. September 25, 2018</b>
    <b>Bonhams, Sep. 25:</b> Lewis, Meriwether. Contemporary manuscript true copy of his final power of attorney, 1809. $8,000 to $12,000
    <b>Bonhams, Sep. 25:</b> <i>A New Method of Macarony Making, as Practiced at Boston in North America.</i> Mezzotint. London, 1774. $5,000 to $7,000
    <b>Bonhams, Sep. 25:</b> <i>Scientific Base Ball Pitching: A Treatise on the Pitcher, Pitching, Origin and Philosophy of the Curve.</i> Chicago, 1897. $2,000 to $3,000
  • <b>Swann Auction Galleries Sep 27:</b> Franklin H. Brown, <i>State Sovereignty, National Union,</i> Chicago, 1860. $6,000 to $9,000.
    <b>Swann Auction Galleries Sep 27:</b> Thomas Paine, <i>The American Crisis,</i> Fishkill, NY, December 1776. $25,000 to $35,000.
    <b>Swann Auction Galleries Sep 27:</b><br>The Aitken Bible, Philadelphia, 1781. $20,000 to $30,000.
    <b>Swann Auction Galleries Sep 27:</b> Francisco Loubayssin de Lamarca, probable first edition of the first novel set in the Spanish New World, Paris, 1617. $15,000 to $25,000.
    <b>Swann Auction Galleries Sep 27:</b> Juan de la Anunciación, <i>Sermonario en lengua mexicana,</i> first edition, first book of sermons in Nahuatl, Mexico, 1577. $30,000 to $40,000.
    <b>Swann Auction Galleries Sep 27:</b> Maturino Gilberti, <i>Thesoro spiritual en lengua de Mechuacá,</i> first edition, Mexico, 1558. $15,000 to $25,000.
    <b>Swann Auction Galleries Sep 27:</b> Commission of William O. Stoddard as secretary to the president, signed by Lincoln, Washington, 1861. $7,000 to $10,000.
    <b>Swann Auction Galleries Sep 27:</b> <i>Clay and Frelinghuysen,</i> flag banner, circa 1844. $8,000 to $12,000.
    <b>Swann Auction Galleries Sep 27:</b> Daguerreotype of a man believed to be Frederick Granger Williams Smith, son of Joseph Smith, circa late 1850s. $10,000 to $15,000.
    <b>Swann Auction Galleries Sep 27:</b> John C. Wolfe, <i>Portrait of Abraham Lincoln,</i> oil on board in period wooden frame, circa 1860s. $12,000 to $18,000.
    <b>Swann Auction Galleries Sep 27:</b> Francis W. Winton, manuscript on pow-wows with indigenous Canadians, 1881. $15,000 to $25,000.
    <b>Swann Auction Galleries Sep 27:</b> Family letters from two young daguerreotype artists, 1826-79. $10,000 to $15,000.

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