“The analogy with the environment [crisis] is apt, because both forms of sustainability - human and environmental - have no market value, they cannot be bought and sold. Both fall into the category of what economists call the tragedy of the commons': in an unfettered market, they are subject to its depredations without any accounting for their true value. Just as the damage to the environment has become increasingly clear, so we will see in the coming decades a growing anxiety about the erosion of human sustainability as we witness an exponential rise in depression, stress and anxiety. It is the conditions of our working lives which are one of the main causes.”