Socially Responsible Investment, Information and the Myth of Underperformance

Socially responsible investment (SRI): selection of investment portfolios with regard to ethical and social criteria in addition to conventional financial considerations, is often considered to bring reduced financial performance, although empirical evidence is inconclusive. Five possible sources of divergence in the performance of socially responsible and conventional investments have been proposed in the literature, and are further examined here. Two proposed mechanisms (the ‘anticipation effect’ and the ‘positive selection effect’) describe firms in which investment is potentially made. Since such opportunities are available to all investors, these are unlikely sources of systematic divergence. Concern (the ‘diversification effect’) that SRI constraints prevent adequate portfolio diversification is shown to be ill founded. The greater proportion of smaller companies in SRI portfolios links to an ongoing debate regarding the ‘small companies effect’, in which smaller companies have at times appeared to have superior (and more recently, inferior) performance, while other studies suggest that this is merely an artefact of the methodology used. It is argued that none of the above provides a basis for expectations of inferior SRI performance. Furthermore, SRI portfolio managers gather additional company information and also increasingly engage in dialogue with companies. It is argued that this ‘information effect’ is a possible source of superior SRI performance.