The economic crisis has shown that the economic behaviour of a few institutions can threaten the economic survival of individuals and even states today. Sustainable economic behaviour is different. It aims to generate security not only now but also in future – not only for oneself but also for the others concerned. If the economy is to be sustainable it needs a conceptual change. This change should take responsibility not only for the current economic behaviour and its results but also take into account the wellbeing of future generations. A possible way forward to accomplish might be the moral and international legal principle of intergenerational equity.