Editing Substitute good (section)

===Unit-demand goods===
[[Unit demand|Unit-demand goods]] are categories of goods from which consumer wants only a single item. If the consumer has two unit-demand items, then his utility is the ''maximum'' of the utilities he gains from each of these items. For example, consider a consumer that wants a means of transportation, which may be either a car or a bicycle. The consumer prefers a car to a bicycle. If the consumer has both a car and a bicycle, then the consumer uses only the car. The economic theory of unit elastic demand illustrates the inverse relationship between price and quantity.<ref>{{Cite web |title=Unit Elastic Demand {{!}} Meaning, Example, Analysis, Conclusion |url=https://studyfinance.com/unit-elastic-demand/ |access-date=2022-04-24 |website=studyfinance.com}}</ref> Unit-demand goods are always substitutes.<ref>{{Cite book| publisher = Cambridge University Press| isbn = 978-1-316-80024-9|last = Bichler| first = Martin| title = Market Design: A Linear Programming Approach to Auctions and Matching| date = 2017| pages = 145| url = https://books.google.com/books?id=MwxFDwAAQBAJ&q=unit-demand&pg=PA145| access-date = 20 August 2019}}</ref>