Ecological Quotes
1973 Lecture. The phrase is thought to have been coined anonymously, perhaps referring to the 19c US tradition of supplying food in bars to patrons buying drinks.
Charles Eisenstein (2011). “Sacred Economics: Money, Gift, and Society in the Age of Transition”, p.127, North Atlantic Books
Ecological differentiation is the necessary condition for coexistence.
Garrett James Hardin (1961). “Biology, its principles and implications”