id	keyword
ejpam-2948	causality
ejpam-2948	variables
ejpam-2948	granger
ejpam-2948	x2,t
ejpam-2948	hendry
ejpam-2948	model
ejpam-2948	non
ejpam-2948	time
ejpam-2948	exogeneity
ejpam-2948	oxford
ejpam-2948	changes