About: http://webisa.webdatacommons.org/391868489

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	risk-free interest rate is based upon the U.S. Treasury yield curve in effect at the time of grant for periods corresponding with the expected life of the options.
http://www.w3.org/ns/prov#wasQuotedFrom	marketplace.org