This book describes and advocates Intelligent National Frugality, a proposed new approach to human economic and social activity. Instead of promoting mindless consumerism the INF approach focuses on human communities, human aspirations and real human needs. It also places a very high value on environmental concerns, including the need to steadily reduce humanity's greenhouse gas emissions. Perhaps surprisingly, the INF approach can be combined with free enterprise, with socialism or with any combination of the two. By rejecting the foolish and risky ideology of endless growth, the approach opens a great many doors-ethical doors as well as economics ones-that arguably lead to a far more satisfactory and a far worthier human society, for our descendants as well as for ourselves.