About: http://webisa.webdatacommons.org/40391801

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	Tools and materials, like other things, have originally cost nothing but labour; and have a value in the market only because wages have been paid for them.
http://www.w3.org/ns/prov#wasQuotedFrom	econlib.org