"Ecologists and economists made unlikely partners -- indeed, these disciplines have often appeared at odds with, and determined to ignore, each other... The modeling of ecological communities or systems seemed purposely to leave out the human economy.6 At the same time, economists either took for granted or ignored the principles, powers, or forces that ecologists believed governed the world's natural communities. The market mechanism, or competitive equilibrium, that mainstream economists studied assigned no role to the natural ecosystem.7 Ecological economics sought to embed the study of economics within a larger understanding of how ecosystems work."