She would tell us that there is nothing static about stability. In nature a system that looks stable and seems to be in equilibrium is not static. A system that looks static and is static is a system that’s about to die. Mother Nature knows that to remain stable you have to be open to constant change, and no plant or animal can take its position in the system for granted—just as a durable economy, says the University of Maryland’s Herman Daly, is macro-stable but micro-variable.

