  Various formulations of counterfactual general equilibrium in economies --
systems of actors manipulating economic goods -- are logically and
mathematically analyzed. Evenly-rotating economies are systems whose evolution
is stable, steady, and form-preserving. Several of their qualities are
qualities of homeorhesis but they are not in homeostasis: because their
instantaneous state is not steady, or in other words, they are not stationary.
What is possibly stationary in whole economies is change over time of behavior
of their parts in a way that causes that net of relations of these parts which
results to be preserved over time. Necessary existence of actual disequilibrium
and impossibility of actual or ultimate equilibrium is demonstrated and
different types of equilibrium and disequilibrium are discussed.
