Editing Indifference curve (section)

== History ==
The theory of indifference curves was developed by [[Francis Ysidro Edgeworth]], who explained in his 1881 book the mathematics needed for their drawing;<ref>{{cite book | url=http://onlinebooks.library.upenn.edu/webbin/book/lookupid?key=olbp34052 | author=Francis Ysidro Edgeworth | title=Mathematical Psychics: An Essay on the Application of Mathematics to the Moral Sciences | location=London | publisher=C. Kegan Paul and Co. | year=1881 }}</ref> later on, [[Vilfredo Pareto]] was the first author to actually draw these curves, in his 1906<!---the article said 1906, however, the book reference pointed to a 1919 book; maybe it is a later edition---> book.<ref>{{cite book | url=https://archive.org/details/manualedieconomi00pareuoft | author=Vilfredo Pareto | title=Manuale di Economia Politica &mdash; con una Introduzione alla Scienza Sociale |trans-title=Manual of Political Economy | location=Milano | publisher=Societa Editrice Libraria | series=Piccola Biblioteca Scientifica | volume=13 | year=1919 }}</ref><ref>{{Cite web|url=https://policonomics.com/indifference-curves/|title=Indifference curves {{!}} Policonomics|language=en-US|access-date=2018-12-08}}</ref> The theory can be derived from [[William Stanley Jevons]]' [[ordinal utility]] theory, which posits that individuals can always rank any consumption bundles by order of preference.<ref>{{cite web|url=http://www.policonomics.com/william-stanley-jevons/|title=William Stanley Jevons - Policonomics|website=www.policonomics.com|access-date=23 March 2018}}</ref>