The ongoing climate, resource, and financial crises underscore the failure of a prosperity model based on growth and dependency on consumption. An ecological uncoupling of economic growth is not in sight. In an expanding economy, rebound effects wipe out advances in dematerialization or decarbonization. Furthermore, an important finding of the so-called science of happiness postulates that once a certain level has been reached, an increase in monetary or material wealth no longer contributes to subjective wellbeing. In place of expansive green economy policies, it is time to take a look at the concept of post-growth economics. Altogether five steps mark the way to a post-growth economy, namely (1) sufficiency as an act of clearing out or throwing off ballast, (2) new adjustment of the balance between self-supply and external supply, (3) de-globalization by regional cycles and complementary currencies, (4) material zero-sum games and (5) institutional innovations.