<http://webisa.webdatacommons.org/prov/392419498> <http://www.w3.org/ns/prov#wasDerivedFrom> <http://webisa.webdatacommons.org/292875315> . <http://webisa.webdatacommons.org/292875315> <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/prov#Entity> . <http://webisa.webdatacommons.org/292875315> <http://www.w3.org/ns/prov#value> "Silver is a market where buying low and selling high, using a rigid system of entry and exit points, is very profitable." . <http://webisa.webdatacommons.org/292875315> <http://www.w3.org/ns/prov#wasQuotedFrom> <silverdoctors.com> .