The 20th century has been marked by the growing awareness of the unbearable gap between developed and under-developed countries. And the most outstanding fact of the next century will probably be the worsening in this imbalance. In order to find a solution to the under-development scandal, Alain Peyrefitte attempts to understand the miracle of development. He examines the successive miracles which have allowed a part of humanity to pull through the turns of dictatorship or anarchism, violence and destitution.