future internet Article Utility of Sharing Economy Principles in the Development of Applications Dedicated to Construction Cost Estimation Adrian Sfichi 1,*, Eduard Zadobrischi 2,3,* , Narcisa Sfichi 1, Marian Bădelit,ă 1 and Mihai Medrihan 1 1 Glocal Soft S.R.L, Strada Fântâna ...