The implicit target of almost all policymaking is to maximise either national income, expressed as GDP, or things that national income can buy. The weaknesses of GDP as an indicator of societal well-being are well documented. A huge flaw is that it fails to capture contributions to well-being for which there is no market. Hence:
No less fundamental than its source, then, are questions of the quantity of energy consumed, the ways in which it is distributed, and the purposes it serves. This issue of quantity versus quality has largely been ignored in mainstream environmental discourses — partly because the imperative to reduce total energy usage solicits [sic] no tech-driven solutions that money can buy. Not cool, Mireille Roddier, 'Places', September 2026
And:
Defensive medicine can be simply defined as medical responses undertaken to avoid liability rather than to benefit the patient. Billions for Defense: The Pervasive Nature of Defensive Medicine, Richard E Anderson, The Doctors Company, November 1999
In both cases the market fails society. In the first case by encouraging energy consumption that is excessive, in that environmental costs aren't captured by the market and so borne by society. In the second, the costs of excessive screening and treatment are similarly borne by society.
A Social Policy Bond regime could reduce the costs to society of these market failures; it would do so by explicitly identifying our goals, and rewarding people for achieving them. A vital first step is to be explicit about exactly what we want to achieve. So, if energy consumption itself is seen as undesirable, we could reward those bring about its reduction. More likely, it's the environmental costs of energy consumption that we regard as problematic, and applying the Social Policy Bond idea to the environment would achieve that goal.
Similarly, defensive medicine occurs because we do not explicitly target or reward improvements in society's health; mostly we reward medical interventions, and so incentivise their excessive use. Applying the Social Policy Bond idea to health would help solve this problem. A government could issue Tradeable Health Outcome Bonds, targeting an array of health indicators, each of which would have to fall within an approved range for a sustained period before the bonds would be redeemed.
Social Policy Bonds express policy goals in terms of outcomes, rather than the alleged, and often very indirect, means of achieving them. Their aim is to encourage people to research, experiment and refine diverse, adaptive approaches to solving our long-term social and environmental problems; many of which are hugely important, but have been neglected because markets don't or can't address them.