About: http://webisa.webdatacommons.org/24020220

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	A few articles of manufacture of exceptional richness" as the subjects of monopoly, such as opium, tobacco, salt and matches, have been hit upon by the governments of several European countries.
http://www.w3.org/ns/prov#wasQuotedFrom	econlib.org