<http://webisa.webdatacommons.org/prov/500581294>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/289964413> .
<http://webisa.webdatacommons.org/289964413>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/289964413>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<coursehero.com> .
<http://webisa.webdatacommons.org/289964413>	<http://www.w3.org/ns/prov#value>	"It is essential to distinguish between the common costs and the separable costs of serving the two types of demand." .