In theoretical economics rent is a concept introduced by [[David Ricardo]] and is the the excess of the produce or return yielded by a given piece of cultivated land over the cost of production; the yield from a piece of land or [[real estate]]."<ref>{{cite web|work=Dictionary.com|url=http://dictionary.reference.com/browse/Rent|title=rent|format=HTML|language=English|accessdate=2007-09-30}}</ref> | In theoretical economics rent is a concept introduced by [[David Ricardo]] and is the the excess of the produce or return yielded by a given piece of cultivated land over the cost of production; the yield from a piece of land or [[real estate]]."<ref>{{cite web|work=Dictionary.com|url=http://dictionary.reference.com/browse/Rent|title=rent|format=HTML|language=English|accessdate=2007-09-30}}</ref> |