Economic theory suggests the returns to land and other natural resources are economic rents that cannot be reduced in such a way because of their perfect inelastic supply. Some economic thinkers emphasize the need to share those rents as an essential requirement for a well functioning market. It is suggested this would both eliminate the need for regular taxes that have a negative effect on trade (see deadweight loss) as well as release land and resources that are speculated upon or monopolised. Two features that improve the competition and free market mechanisms. Winston Churchill supported this view by the following statement: "Land is the mother of all monopoly". The American economist and social philosopher Henry George, the most famous proponent of this thesis, wanted to accomplish this through a high land value tax that replaces all other taxes. Followers of his ideas are often called Georgists or geoists and geolibertarians.