Transformation in economics refers to a long-term change in dominant economic activity in terms of prevailing relative engagement or employment of able individuals. Human economic systems undergo a number of deviations and departures from the "normal" state, trend or development. Among them are Disturbance (short-term disruption, temporary disorder), Perturbation (persistent or repeated divergence, predicament, decline or crisis), Deformation (damage, regime change, loss of self-sustainability, distortion), Transformation (long-term change, restructuring, conversion, new “normal”) and Renewal (rebirth, transmutation, corso-ricorso, renaissance, new beginning).