What bothers me is that every year we get new, lighter, cheaper, faster, building materials, every year we improve construction processes, every year we're buil

What bothers me is that every year we get new, lighter, cheaper, faster, building materials, every year we improve construction processes, every year we're building more and more floors in same period of time and yet still appartments and houses are getting more and more expensive despite of all these improvement's. Can someone pls explain me how's that possible? Am I overestimating improvements?