<http://webisa.webdatacommons.org/prov/409617410>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/336485147> .
<http://webisa.webdatacommons.org/336485147>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<blogspot.com> .
<http://webisa.webdatacommons.org/336485147>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/336485147>	<http://www.w3.org/ns/prov#value>	"As Sraffa showed, even in a barter economy with growth, there can be as many natural rates of interest as there are commodities." .