Policy-makers world-wide have proposed a new contract – the “social impact bond” (SIB) – which they claim can allay the underperformance and underfunding afflicting not-for-profit sectors, by tying the private returns of (social) investors to the success of social programs (Bolton 2010;...

Null Hypothesis Significance Testing has been widely used in the experimental economics literature. Typically, attention is restricted to type-I-errors. We demonstrate that not taking type-II errors into account is problematic. We also provide evidence, for one prominent area in experimental...

Policymakers worldwide have proposed a new contract – the ‘social impact bond’ (SIB) – which they claim can allay the underperformance afflicting not-for-profits, by tying the private returns of (social) investors to the success of social programs. We investigate experimentally how SIBs...