About: http://webisa.webdatacommons.org/441794210

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	Given every student has an individual answer sheet, observing the divergent attitude directly is harder, thus the incentive to diverge and the more persistent equilibrium, i.e. everybody takes an exam.
http://www.w3.org/ns/prov#wasQuotedFrom	freakonomics.com