About: http://webisa.webdatacommons.org/210487418

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	World monopolies of oil, mercury, zinc, nickel, and other materials can occasionally be formed if the owners of the rare places where they exist can combine; examples of this are found in the history of recent years.
http://www.w3.org/ns/prov#wasQuotedFrom	libertyfund.org