Description: Models are imperfect approximations of reality. Once a bubble has been recognized, that’s the time for mechanisms of caution and prudence to kick in, even in the face of exuberance – especially in the face of exuberance. Liquidity and trust is plentiful until it’s not – it can evaporate with blazing speed and only returns slowly. Risk is contagious, which means every single employee and citizen has a vested interest in taking on the role of chief risk officer.