id	keyword
ajceb-4168	construction
ajceb-4168	efficiency
ajceb-4168	sector
ajceb-4168	frontier
ajceb-4168	production
ajceb-4168	doi
ajceb-4168	model
ajceb-4168	economics
ajceb-4168	journal
ajceb-4168	firms
ajceb-4168	data
ajceb-4168	period
ajceb-4168	analysis
ajceb-4168	industry
ajceb-4168	building