This study offers new insight into the economies of scale of ICT departments. Drawing from data on Housing Corporations, Municipalities and Hospitals, evidence was found that particularly infrastructure-related investments leverage a more efficient use of ICT resources. The measured economies between low and high infrastructure spending organizations are on average more than 20% for their operational ICT labour and for their total ICT costs. It was also found that organizations should spend a certain minimum of their ICT expenditure on applications to realize economies of scale in their...