About: http://webisa.webdatacommons.org/192220242

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	Portfolio insurance, the cause of the 1987 crash, is a program that specifically sells when prices go down and buys back in once prices have risen substantially.
http://www.w3.org/ns/prov#wasQuotedFrom	econlib.org