The system of economics in use around the world today is based on self-interest and maximizing behavior. If we were honest with ourselves we would acknowledge that self-interest is selfishness and maximizing behavior is greed. So our world is being run on the principles of greed and selfishness. And we wonder why there are so many problems in the world.
I must say the obvious. Selfishness and greed are not the best principles developed by humans. We have a long history on earth and a long history of thoughtfulness. Religions have developed from the need for human beings to transcend their smallness and accept their larger roles in life. Philosophy has developed to examine ways in which human beings can use reason to expand their understanding of themselves. The arts, the sciences, the humanities, literature, theater, dance, film, painting, sculpture, have all developed as a result of our innate ability to think big and to think large. To think big is to not be petty and to think large is to embrace all of humanity and its future on earth.
An economics based on selfishness and greed seems to me a particularly small view of mankind. By starting from a point of view of humans at their very least, their most base, crude, and thoughtless instincts, modern economics is sadly out of date with the evolution of human consciousness.