Rory Sutherland puts it this way:
And this shows that engineers, medical people, scientific people, have an obsession with solving the problems of reality. When actually most problems, once you reach a basic level of wealth in society, most problems are actually problems of perception.
I love that quote, but you should do yourself a favour and watch his whole TED talk. It is brilliant.
And I’m not just saying that because it features Shreddies. (Homesickness trigger.)