According to Bertrand Russell
Change is one thing, progress is another. Change is scientific, progress is ethical; change is indubitable, whereas progress is a matter of controversy.
Sigmund Freud in his Civilization and Its Discontents claims that we cannot be sure that we are happier than those who lived under harsh conditions several centuries ago, because human mind is very flexible.
Very often I ask myself if we, as people who have access to the internet, education, modern medicine, etc. are really happier than the tribal people who, for example, live a much simpler life in a jungle? And sometimes I watch documentaries about such people, and they don't seem to be more sad or depressed than us.
Human society has changed hugely since 1,000 years ago or since the Neolithic Revolution about 12,000 years ago. But have we made progress since those times?
I think psychologists have started to measure human happiness in different countries. I wish they would measure it in very simple societies as well.