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SOCIAL IMPACT INVESTMENT: BUILDING THE EVIDENCE BASE<br />

benefits measured in monetary terms (even if the benefits themselves are not pecuniary). Cost effectiveness<br />

analysis (CEA) compares the costs of meeting a given policy objective by alternative means.<br />

7.33 The distinction is important. In the case of CBA, accurate information on the costs of meeting the<br />

objective must be available. Secondly, and most importantly, the program benefits must be valued even if<br />

they are not market goods (i.e. do not have a price). By expressing costs and benefits in the same units,<br />

CBA is used to indicate whether a given policy objective is desirable When used on its’ own CEA cannot<br />

help the policymaker decide what the policy objective should be since the benefits and costs are not<br />

expressed in the same units. This also means that it is impossible to compare across different policy<br />

domains. As such it cannot be used to determine whether the policy is welfare-improving in the strict<br />

sense. Rather CEA is used to determine the costs of meeting a given objective, and to compare between the<br />

costs of meeting that given objective through alternative means.<br />

7.34 In the context of policy discussions related to SII the role of CBA is limited for a number of<br />

reasons. First, social impact investors and investees may have objectives related to social needs which are<br />

distinct from (and in many cases be more ambitious than) stated policy objectives. Second, the investor and<br />

the investee derive a value from the investment which may or nor may not be identical to that which is<br />

appropriate for the evaluation of public policy. 36<br />

7.35 The role of CEA in policy discussions about SII is more obvious. For instance, CEA can be<br />

applied to evaluate healthcare policies, for which it can be difficult to assess the monetary benefits but it is<br />

relatively straightforward to determine the desired outcome (e.g. “number of lives saved” or “DALYs”<br />

[EuropeAid, 2005]). CEA measures costs in monetary terms and compares them with the outcomes,<br />

expressed in terms of relevant units which related to the social need in question. The ratio of costs to<br />

effectiveness is computed in order to determine the cost per unit of effectiveness; the most effective<br />

projects will have lower cost-effectiveness ratios than alternatives.<br />

7.36 This methodology is directly relevant for the case of SII. Firstly, investors and investees may<br />

well be interested in knowing whether or not their investments are meeting their objectives in terms of<br />

social needs at least cost. Secondly, policymakers would be interested in knowing whether different policy<br />

measures which incentivise the development of SII may be a more efficient way to meet their policy<br />

objective than more traditional state-managed forms of service delivery.<br />

7.37 The evaluation should be as comprehensive as possible in the determination of costs and benefits,<br />

accounting for indirect and long-term effects of the program and reflecting the interests of all stakeholders<br />

involved (Better Evaluation, 2014a and 2014b). Interventions with social savings expectations and social<br />

outcomes expectation can undertake both forms of evaluations.<br />

7.4.2. Measuring social impact: selecting social outcome measures<br />

7.38 Any type of social intervention is designed to achieve a social goal, SII is not different. The<br />

importance of measuring social outcomes was highlighted by the SIITF as well as by the Working Group<br />

on <strong>Impact</strong> Measurement (WGIM, 2014). The social outcomes defined by a social intervention should meet<br />

some standards, including: being predefined, measureable, valid, repeatable, and independent (not<br />

distortable). <strong>Social</strong> outcome monitoring may also include the addition of spillover measures, or timesensitive<br />

changes to the social outcomes desired.<br />

36 . For example in the case of CBA it is important to draw a distinction between paternalistic and<br />

non-paternalistic altruism, and it is only the former which is relevant when ascertaining whether or not a<br />

policy intervention is welfare-improving. See Johansson (1992) for a discussion.<br />

© OECD 2015 119

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