Economics of patents

<h2 id="costs-benefits-risks-of-the-patent-system-to-the-public">Costs, benefits, risks of the patent system to the public</h2>
The patent system is designed to encourage innovation. This is because patents, by conferring rights on the owner to exclude competitors from the market, presumably offer the incentive for people to study new technology.
In some fields, particularly pharmaceuticals, it is also argued that the monopoly of the patent in the market allows the owner to recover the huge expenses invested in the research and development phase.<a class="footnote-ref" id="fnref:3" href="#fn:3">3</a>
While patent offices in the economically advanced world have numerous procedures in effect to determine the validity and proper scope of a patent application, nevertheless some patents still issue that are not an advance on the existing state-of-the-art, or would otherwise be invalid if challenged. The system corrects these mistakes by maintaining the right to nullify inappropriately issued patents. However, in part because of high litigation costs, only a very small fraction of patent disputes ever go to court. A study in 2005 showed that among 200,000 patents that are issued every year, only 1.5 percent of patents are ever litigated, and only 0.1 percent of patents are ever litigated to trial.<a class="footnote-ref" id="fnref:4" href="#fn:4">4</a> This means the majority of patent disputes are either overlooked or settled privately. While private settlement is a cost-effective way to balance the commercial interests of two firms, the public does not benefit from it. Because of the private nature of such settlements, there is no open discussion that would clarify the scope of rights under a particular patent and the opportunity to invalidate the patent is lost. Other competitors do not benefit, and costs across the industry are not reduced.

<h3>Economics of probabilistic patents</h3>
Economists <a href="/facts/Mark_Lemley/22MHDUBJ">Mark Lemley</a> and <a href="/facts/Carl_Shapiro/XRnqYPQ2">Carl Shapiro</a> argued that the patent granting process should be rethought because there are inherent uncertainties with the system. Uncertainty in patents can be found in the two fundamental dimensions:

<ol><li>uncertainty about the commercial significance of the invention being patented</li>
<li>uncertainty about the validity and scope of the legal right being granted.</li></ol>
Modeling patents as probabilistic rights is helpful in assessing the social costs of the system while continuing to encourage innovation and technology dissemination.<a class="footnote-ref" id="fnref:5" href="#fn:5">5</a>

<h2 id="macroeconomic-perspective">Macroeconomic perspective</h2>

The patent system affects the <a href="/facts/Economy/okLWSsEY">economy</a> as a whole. The benefits of new results, once the <a href="/facts/Research/mo8joeTL">research</a> is publicly known, are available to all in the relevant field, thereby bringing advantages to all parties in that field, though reducing the direct return to the party performing the pioneering research. This reduces economic incentive for a party to conduct research and innovate.
The effects of patents on a given market may vary widely according to the type of market, and whether there are other barriers to entry (e.g., business methods versus regulated medications).
Even in socialist monopole economies, the adherence to international patent laws was or becomes strict, as the effect is reciprocal for public economy, as soon as the level of technology development in these economies creates comparable advantage.<a class="footnote-ref" id="fnref:6" href="#fn:6">6</a>
However, since patents essentially encourage innovation by giving owners the right to monopolize the market for a limited time, the public will suffer from the patents that are not innovative by paying a supracompetitive cost.
Another dilemma regarding the patent system's effectiveness is that if the validity and scope were unclear at the issuance, it will always be corrected because other competitors will cause the case to the court and then we could either reevaluate the scope through discussion or invalidate the patent for public good. However, studies of the USPTO data showed that only very few patents are litigated to trial.<a class="footnote-ref" id="fnref:7" href="#fn:7">7</a>
Farrell and Merges (2004) pointed out that two reasons have kept individual firms accused of <a href="/facts/Patent_infringement/7vH9JvMF">patent infringement</a> from challenging the patent's holders. The first one is the public good problem, which means that once the patent is nullified, the competitors of the accused firm will benefit from the outcome. The other reason is that in many cases they can pass-through the uniform royalty costs in the form of higher prices.<a class="footnote-ref" id="fnref:8" href="#fn:8">8</a>

<h2 id="microeconomic-perspective">Microeconomic perspective</h2>
The economics surrounding a single patent, or group of patents, revolves around the balance between the expense of maintaining the patent(s), and the income derived from owning that/those patents.<a class="footnote-ref" id="fnref:9" href="#fn:9">9</a> Similarly the economics of whether to seek a patent present similar concerns with the added up-front costs of obtaining the patent.
The grant of a patent provides the inventor temporarily with an exclusive legal right, thereby securing a means to redeem the costs of research (by charging a higher price for its invention or by license fees from others who wish to practice it).
A patent is an exclusionary right – preventing others from entering the market – and so its effect may be to increase the patent proprietor's income from that market. The major economic effect is the exclusivity period of the patent rights, when exploitation pays back for the enterprise that funded <a href="/facts/Research_and_development/2h5UddUu">research and development</a>. However, patenting alone does not guarantee for marketing success.
The right to exclude others from entering market with copies is, however, potentially extremely valuable as it can mean total exclusivity in that market for the duration of the patent (generally 20 years from filing). For example, worldwide sales of a patented <a href="/facts/Pharmaceutical/h9mhwWP2">pharmaceutical</a> can be millions of dollars per day, whereas the generic equivalent would later sell for less than half the price.
Income improvement from a patent is difficult to measure. One may attempt to measure the difference in price between an "improved" product and its "unimproved" counterpart, or compare the price of the product with that in markets where (or when) it has not been patented. More directly measurable income is that which is received from the licensing or sale of patent rights, or from successful litigation of infringement.

<h2 id="innovation">Innovation</h2>
Under traditional patent doctrine, innovation is spurred by patent law in at least two ways. (1) The inventor can secure exclusive rights, and therefore working on innovation gives the inventor a higher probability of financial rewards in the market place.<a class="footnote-ref" id="fnref:10" href="#fn:10">10</a> (2) Publishing the invention, rather than keeping it a <a href="/facts/Trade_secret/VgJ1cAz5">trade secret</a> allows others to build upon the technology.<a class="footnote-ref" id="fnref:11" href="#fn:11">11</a> Both of these have been challenged based upon economic analysis. The "rewards" theory has been criticized as ignoring the risky prospective nature of the "reward",<a class="footnote-ref" id="fnref:12" href="#fn:12">12</a> and the post patent costs of cost-engineering and marketing.<a class="footnote-ref" id="fnref:13" href="#fn:13">13</a><a class="footnote-ref" id="fnref:14" href="#fn:14">14</a> The "publication of the patent as spurring innovation" branch has been criticized indicating that it produces <a href="/facts/Patent_thicket/03FN3bs8">patent thickets</a> and encouraging others to design around existing technology rather than to build upon it.<a class="footnote-ref" id="fnref:15" href="#fn:15">15</a>
As early as 1986, empirical research into the effect of patent law on innovation found "its effects in this regard are very small in most of the industries we studied".<a class="footnote-ref" id="fnref:16" href="#fn:16">16</a> In 2013, Boldrin and Levine concluded that "while patents can have a partial equilibrium effect of improving incentives to invent, the general equilibrium effect on innovation can be negative."<a class="footnote-ref" id="fnref:17" href="#fn:17">17</a> Other patent modeling research suggests that rather than encouraging innovation, patents can hinder development, lower <a href="/facts/R%2526D/2h5UddUu">R&D</a> investments, and decrease overall economic output.<a class="footnote-ref" id="fnref:18" href="#fn:18">18</a>

<h2 id="patent-valuation">Patent valuation</h2>
Main article: <a href="/facts/Patent_valuation/akUkEIko">Patent valuation</a>
Patents are not intrinsically valuable, in the sense that a patent is not economically an "end in itself."<a class="footnote-ref" id="fnref:19" href="#fn:19">19</a> Rather, a patent claiming an invention with market demand would likely have economic value because the patent holder can exclude others from making, importing, using, and offering for sale, or selling that invention throughout the jurisdiction (the US for example<a class="footnote-ref" id="fnref:20" href="#fn:20">20</a>) and sell the product at a <a href="/facts/Monopoly_price/cYkWhdMb">monopoly price</a>. Without alternative suppliers for the patented good or technology, the price the patentee is able to charge would likely be greater than the competitive price (the price in a <a href="/facts/Competitive_equilibrium/GlnKufc6">competitive equilibrium</a>). This portion of incremental profit would only be attributable to the patent and would therefore be the value of the patent.<a class="footnote-ref" id="fnref:21" href="#fn:21">21</a>
Patent value, like value of other <a href="/facts/Property/F6bGqY2w">property</a>, may fluctuate over time, as markets change.<a class="footnote-ref" id="fnref:22" href="#fn:22">22</a> What was once a pioneering invention may be soon outsold by an unpatented (and non-infringing) competitor catering to fringe adopters with products having features even more desirable than the invention.<a class="footnote-ref" id="fnref:23" href="#fn:23">23</a> Contrarily, a strong patent grip could stagnate a narrow market as innovation is no longer justified, eventually resulting in reduced demand (for outmoded and over-priced products), and thus reduced patent value, as the market moves away.<a class="footnote-ref" id="fnref:24" href="#fn:24">24</a><a class="footnote-ref" id="fnref:25" href="#fn:25">25</a><a class="footnote-ref" id="fnref:26" href="#fn:26">26</a>
A particularly difficult question of value arises where inventors/owners use their patents to extract other advantages without actually marketing the invention (e.g., cross-licensing of related patents to avoid litigation, or suppressing a technology that could compete with the owner's other products).<a class="footnote-ref" id="fnref:27" href="#fn:27">27</a> How can one determine the value of a patented product (and the underlying patent) that has not actually been produced, let alone sold in any quantity? Furthermore, many products incorporate numerous patented inventions (owned or licensed), and may carry exclusive trademarks, making it difficult to attribute a specific value to an individual patent. Would the same invention be as valuable if owned and marketed under a weak brand?
In 2005, the European Commission published a comprehensive study of the value of patents for patent owners as well as for the European economy.<a class="footnote-ref" id="fnref:28" href="#fn:28">28</a> The study was in part based on a survey of 20,000 patent owners who applied for EPO patents between 1993 and 1997. The survey was performed in 2003. 9000 patent owners responded. The patent owners were asked how much effort was required to produce their inventions and how much monetary value their patents had been worth. The median effort to create the patentable invention was 1 person-year, with 10% of the patent owners requiring 2 or more person-years. The median value of the patents produced was €300,000, with 10% of patent owners reporting values of €10 million Euros or more.
In certain cases,[which?]<a class="footnote-ref" id="fnref:29" href="#fn:29">29</a> patents may be valued using the techniques developed for <a href="/facts/Option_(finance)/5gJFXV3X">financial options</a>, as applied via a <a href="/facts/Real_options/nFlsfgpL">real options</a> framework.<a class="footnote-ref" id="fnref:30" href="#fn:30">30</a> The key parallel is that a patent provides its owner the right to exclude others from using the underlying invention, so both patents and stock options represent a right to exploit an asset in the future, and to exclude others from using it. The patent (option) will have value to the buyer (owner) only to the extent that the expected price in the future exceeds the <a href="/facts/Opportunity_cost/FYJTAXd6">opportunity cost</a> of earning just as much in a risk-less alternative. Thus patent rights can be thought of as corresponding to a <a href="/facts/Call_option/UUIsmBxN">call option</a> and may be <a href="/facts/Option_(finance)/5gJFXV3X">valued accordingly</a>.<a class="footnote-ref" id="fnref:31" href="#fn:31">31</a> See <a href="/facts/Business_valuation/Fslwea3l">Option pricing approaches</a> under <a href="/facts/Business_valuation/Fslwea3l">Business valuation</a> for further discussion.

<h2 id="see-also">See also</h2>
<ul><li><a href="/facts/Software_patent_debate/zYseIqXq">Software patent debate</a></li>
<li><a href="/facts/Prizes_as_an_alternative_to_patents/0wzJgeWF">Prizes as an alternative to patents</a></li>
<li><a href="/facts/Intellectual_property_valuation/20wbS6mG">Intellectual property valuation</a></li></ul>

<h2 id="external-links">External links</h2>
<ul><li><a href="/facts/David_R._Henderson/0T40jVwT">Henderson, David R.</a> (2002). <a href="http://www.econlib.org/library/Enc1/Patents.html">"Patents"</a>. <a href="/facts/Concise_Encyclopedia_of_Economics/V1Tn3BDf">Concise Encyclopedia of Economics</a> (1st ed.). <a href="/facts/Library_of_Economics_and_Liberty/V1Tn3BDf">Library of Economics and Liberty</a>. <a href="/facts/OCLC_(identifier)/Yqad8waq">OCLC</a> <a href="https://www.worldcat.org/oclc/317650570">317650570</a>, <a href="https://www.worldcat.org/oclc/50016270">50016270</a>, <a href="https://www.worldcat.org/oclc/163149563">163149563</a></li>
<li><a href="https://web.archive.org/web/20070114022902/http://www.wipo.int/patent/law/en/developments/economic.html">Economic Development and Patents</a> and <a href="https://web.archive.org/web/20070117023804/http://www.wipo.int/patent/law/en/developments/competition.html">Competition and Patents</a> on the <a href="/facts/World_Intellectual_Property_Organization/lenC10SK">WIPO</a> web site</li></ul>

<h2 id="references">References</h2>

<ol>
<li id="fn:1">"Our Business: An Introduction to the USPTO". United States Patent and Trademark Office. Archived from the original on 30 December 2011. <a href="https://web.archive.org/web/20111230081944/http://www.uspto.gov/web/menu/intro.html" target="_blank">https://web.archive.org/web/20111230081944/http://www.uspto.gov/web/menu/intro.html</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></li>
<li id="fn:2">"Datasheet for the decision of 11 December 2018 (T 2707/16)" (PDF). Boards of Appeal of the European Patent Office. reasons 18. Archived from the original (PDF) on 20 January 2022. The basic idea and core purpose of the patent system is to stimulate technological innovation by offering the opportunity to obtain exclusionary rights limited in time in return for public disclosure of inventions. <a href="https://web.archive.org/web/20220120095827/https://www.epo.org/law-practice/case-law-appeals/pdf/t162707eu1.pdf" target="_blank">https://web.archive.org/web/20220120095827/https://www.epo.org/law-practice/case-law-appeals/pdf/t162707eu1.pdf</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></li>
<li id="fn:3">Werth, Barry (2013). "A Tale of Two Drugs". MIT Technology Review. 116 (6). Archived from the original on 26 June 2014. <a href="https://web.archive.org/web/20140626130638/http://www.technologyreview.com/featuredstory/520441/a-tale-of-two-drugs/" target="_blank">https://web.archive.org/web/20140626130638/http://www.technologyreview.com/featuredstory/520441/a-tale-of-two-drugs/</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></li>
<li id="fn:4">Lemley, Mark A.; Shapiro, Carl (2005). "Probabilistic Patents" (PDF). Journal of Economic Perspectives. 19 (2): 75–98. doi:10.1257/0895330054048650. Archived (PDF) from the original on 18 November 2005. <a href="http://faculty.haas.berkeley.edu/shapiro/patents.pdf" target="_blank">http://faculty.haas.berkeley.edu/shapiro/patents.pdf</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></li>
<li id="fn:5">Lemley, Mark A.; Shapiro, Carl (2005). "Probabilistic Patents" (PDF). Journal of Economic Perspectives. 19 (2): 75–98. doi:10.1257/0895330054048650. Archived (PDF) from the original on 18 November 2005. <a href="http://faculty.haas.berkeley.edu/shapiro/patents.pdf" target="_blank">http://faculty.haas.berkeley.edu/shapiro/patents.pdf</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></li>
<li id="fn:6">Langinier, Corinne; GianCarlo, Moschini (January 2002). "Chapter 3: The Economics of Patents: An Overview". In Newman, Scott; Rothschild, Max Frederick (eds.). Intellectual Property Rights and Patenting in Animal Breeding and Genetics (PDF). Oxford, England: CABI Publishing. ISBN 978-0-85199-838-1. Archived (PDF) from the original on 15 February 2004. <a href="978-0-85199-838-1" target="_blank">978-0-85199-838-1</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></li>
<li id="fn:7">Lemley, Mark A.; Shapiro, Carl (2005). "Probabilistic Patents" (PDF). Journal of Economic Perspectives. 19 (2): 75–98. doi:10.1257/0895330054048650. Archived (PDF) from the original on 18 November 2005. <a href="http://faculty.haas.berkeley.edu/shapiro/patents.pdf" target="_blank">http://faculty.haas.berkeley.edu/shapiro/patents.pdf</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></li>
<li id="fn:8">Farrell, Joseph; Merges, Robert P. (2004). "Incentives to Challenge and Defend Patents: Why Litigation Won't Reliably Fix Patent Office Errors and Why Administrative Patent Review Might Help". Berkeley Technology Law Journal. 19 (1): 943–970, page 956. Archived from the original on 10 May 2014. <a href="http://scholarship.law.berkeley.edu/cgi/viewcontent.cgi?article=1358&context=facpubs" target="_blank">http://scholarship.law.berkeley.edu/cgi/viewcontent.cgi?article=1358&context=facpubs</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></li>
<li id="fn:9">Kryazhimskii, Arkadii; Watanabe, Chihiro; Tou, Y. (2002). "Dynamic model of market of patents and equilibria in technology stocks". Computers & Mathematics with Applications. 44 (7): 979–995. CiteSeerX 10.1.1.199.4968. doi:10.1016/s0898-1221(02)00208-0. <a href="/wiki/CiteSeerX_(identifier)" target="_blank">/wiki/CiteSeerX_(identifier)</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></li>
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<li id="fn:13">Spulber, Daniel E. (2014). "Patents are the Foundation of the Market for Inventions" (PDF). Northwestern University School of Law. Archived (PDF) from the original on 10 May 2014. <a href="http://www.law.northwestern.edu/research-faculty/searlecenter/events/roundtable/documents/Spulber_Patents_and_the_Market_for_Inventions.pdf" target="_blank">http://www.law.northwestern.edu/research-faculty/searlecenter/events/roundtable/documents/Spulber_Patents_and_the_Market_for_Inventions.pdf</a> <a href="#fnref:13" class="footnote-back-ref">↩</a></li>
<li id="fn:14">Daily, James E.; Kieff, F. Scott (2013). "Anything Under The Sun Made By Humans: Patent Law Doctrines As Endogenous Institutions For Commercializing Innovation" (PDF). Emory Law Journal. 62 (4): 967–981, page 973 ff. Archived (PDF) from the original on 10 May 2014. <a href="http://fstp-expert-system.typepad.com/files/daily-and-kieff-on-patentable-subject-matter-62-emory-l-j-967-2013.pdf" target="_blank">http://fstp-expert-system.typepad.com/files/daily-and-kieff-on-patentable-subject-matter-62-emory-l-j-967-2013.pdf</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></li>
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<li id="fn:16">Mansfield, Edwin (1986). "Patents and innovation: an empirical study" (PDF). Management Science. 32 (2): 173–181, page 180. doi:10.1287/mnsc.32.2.173. Archived from the original (PDF) on 10 May 2014. Retrieved 10 May 2014. <a href="https://web.archive.org/web/20140510221124/http://www.utc.fr/~jollivet/GE21/Centre%20de%20Documentation%20GE21/Mansfield%20Edwin%2C%201986%20-%20Patents%20and%20Innovation%20_%20An%20Empirical%20Study%2C%20Management%20Science.pdf" target="_blank">https://web.archive.org/web/20140510221124/http://www.utc.fr/~jollivet/GE21/Centre%20de%20Documentation%20GE21/Mansfield%20Edwin%2C%201986%20-%20Patents%20and%20Innovation%20_%20An%20Empirical%20Study%2C%20Management%20Science.pdf</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></li>
<li id="fn:17">Boldrin, Michele; Levine, David K. (2013). "The Case Against Patents" (PDF). The Journal of Economic Perspectives. 27 (1): 3–22, page 3. doi:10.1257/jep.27.1.3. Archived (PDF) from the original on 19 September 2012. <a href="http://dklevine.com/archive/refs4786969000000000465.pdf" target="_blank">http://dklevine.com/archive/refs4786969000000000465.pdf</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></li>
<li id="fn:18">Torrance, Andrew W.; Tomlinson (2009). "Patents and the Regress of Useful Arts" (PDF). Columbia Science and Technology Law Review. 10: 130–168. SSRN 1411328. Archived from the original (PDF) on 10 May 2014. Retrieved 20 March 2017. <a href="https://web.archive.org/web/20140510200424/http://www.stlr.org/html/volume10/Torrance.pdf" target="_blank">https://web.archive.org/web/20140510200424/http://www.stlr.org/html/volume10/Torrance.pdf</a> <a href="#fnref:18" class="footnote-back-ref">↩</a></li>
<li id="fn:19">Torres, Fernando. "The Patent Value Guide: General Principles". Archived from the original on 16 January 2013. <a href="http://www.patentvalueguide.com/2011/02/part-i-general-principles.html" target="_blank">http://www.patentvalueguide.com/2011/02/part-i-general-principles.html</a> <a href="#fnref:19" class="footnote-back-ref">↩</a></li>
<li id="fn:20">"What is a patent?". United States Patent and Trademark Office. <a href="http://www.uspto.gov/patents/index.jsp" target="_blank">http://www.uspto.gov/patents/index.jsp</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></li>
<li id="fn:21">Torres, Fernando. "The Patent Value Guide: General Principles". Archived from the original on 16 January 2013. <a href="http://www.patentvalueguide.com/2011/02/part-i-general-principles.html" target="_blank">http://www.patentvalueguide.com/2011/02/part-i-general-principles.html</a> <a href="#fnref:21" class="footnote-back-ref">↩</a></li>
<li id="fn:22">Reitzig, Markus (2003). "What determines patent value?-Insights from the semiconductor industry". Research Policy. 32 (1): 13–26. doi:10.1016/S0048-7333(01)00193-7. <a href="/wiki/Markus_Reitzig" target="_blank">/wiki/Markus_Reitzig</a> <a href="#fnref:22" class="footnote-back-ref">↩</a></li>
<li id="fn:23">Reitzig, Markus (2003). "What determines patent value?-Insights from the semiconductor industry". Research Policy. 32 (1): 13–26. doi:10.1016/S0048-7333(01)00193-7. <a href="/wiki/Markus_Reitzig" target="_blank">/wiki/Markus_Reitzig</a> <a href="#fnref:23" class="footnote-back-ref">↩</a></li>
<li id="fn:24">Sheremata, Willow A. (1997). "Barriers to innovation: A monopoly, network externalities, and the speed of innovation". The Antitrust Bulletin. 42 (4): 937–972, pages 962–963. doi:10.1177/0003603X9704200404. S2CID 168471276. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:24" class="footnote-back-ref">↩</a></li>
<li id="fn:25">Shapiro, Carl (1999). "Exclusivity in Network Industries" (PDF). George Mason Law Review. 7: 673–683, pages 675–677. Archived (PDF) from the original on 19 July 2004. <a href="http://faculty.haas.berkeley.edu/SHAPIRO/exclusivity.pdf" target="_blank">http://faculty.haas.berkeley.edu/SHAPIRO/exclusivity.pdf</a> <a href="#fnref:25" class="footnote-back-ref">↩</a></li>
<li id="fn:26">Park, Jae Hun (2010). Patents and Industry Standards. Cheltenham, Gloucestershire, England: Edward Elgar Publishing. p. 147. ISBN 978-1-84980-011-2. <a href="978-1-84980-011-2" target="_blank">978-1-84980-011-2</a> <a href="#fnref:26" class="footnote-back-ref">↩</a></li>
<li id="fn:27">Andersen, Birgitte; Rosli, Ainurul Afizah (2009). "Economic Strategies and Patent Governance of UK Software Firms: A Study on Financial Benefits, Reputation and Positioning" (PDF). 4th Annual Conference of the EPIP Association, Bologna, 24-25.09/2009. Archived from the original (PDF) on 10 May 2014. Retrieved 10 May 2014. <a href="https://web.archive.org/web/20140510212126/http://www.epip.eu/conferences/epip04/files/ROSLI_Ainurul.pdf" target="_blank">https://web.archive.org/web/20140510212126/http://www.epip.eu/conferences/epip04/files/ROSLI_Ainurul.pdf</a> <a href="#fnref:27" class="footnote-back-ref">↩</a></li>
<li id="fn:28">Gambardella, Alfonso; et al. (9 May 2005). "Study on Evaluation the Knowledge Economy – What are Patents Actually Worth?" (PDF). European Commission, Directorate-General for Internal Market. Archived (PDF) from the original on 12 January 2007. <a href="http://ec.europa.eu/internal_market/indprop/docs/patent/studies/patentstudy-report_en.pdf" target="_blank">http://ec.europa.eu/internal_market/indprop/docs/patent/studies/patentstudy-report_en.pdf</a> <a href="#fnref:28" class="footnote-back-ref">↩</a></li>
<li id="fn:29">See for example: Pitkethly, Robert (1997), The Valuation of Patents: A review of patent valuation methods with consideration of option based methods and the potential for further research (PDF), Judge Institute Working Paper WP 21/97, Cambridge, England: The Judge Institute of Management Studies, archived (PDF) from the original on 16 January 2013; and Reitzig, Markus (2006). "Chapter 15: Valuing patents and patent portfolios from a corporate perspective: theoretical considerations, applied needs and future challenges". In Bosworth, Derek L.; Webster, Elizabeth (eds.). The Management of Intellectual Property. Cheltenham, Gloucestershire, England: Edward Elgar Publishing. ISBN 978-1-84542-112-0. <a href="978-1-84542-112-0" target="_blank">978-1-84542-112-0</a> <a href="#fnref:29" class="footnote-back-ref">↩</a></li>
<li id="fn:30">See Aswath Damodaran: Applications Of Option Pricing Theory To Equity Valuation and Option Pricing Applications in Valuation; Fernando Torres MSc. Conceptual Patent Value Framework, The Patent Value Guide. <a href="/wiki/Aswath_Damodaran" target="_blank">/wiki/Aswath_Damodaran</a> <a href="#fnref:30" class="footnote-back-ref">↩</a></li>
<li id="fn:31">See for example: Pitkethly, Robert (1997), The Valuation of Patents: A review of patent valuation methods with consideration of option based methods and the potential for further research (PDF), Judge Institute Working Paper WP 21/97, Cambridge, England: The Judge Institute of Management Studies, archived (PDF) from the original on 16 January 2013; and Reitzig, Markus (2006). "Chapter 15: Valuing patents and patent portfolios from a corporate perspective: theoretical considerations, applied needs and future challenges". In Bosworth, Derek L.; Webster, Elizabeth (eds.). The Management of Intellectual Property. Cheltenham, Gloucestershire, England: Edward Elgar Publishing. ISBN 978-1-84542-112-0. <a href="978-1-84542-112-0" target="_blank">978-1-84542-112-0</a> <a href="#fnref:31" class="footnote-back-ref">↩</a></li>
</ol>

Economics of patents open-in-new

Economics of patents