About: http://webisa.webdatacommons.org/249465915

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	So many of them are produced every year that a spot markets exists for them, so they can be traded just like other commodities such as oil and wheat.
http://www.w3.org/ns/prov#wasQuotedFrom	computerworld.com.au