Protecting Investors from Themselves: Evidence from a Regulatory Intervention

Retail investors in securities suffer from biases and consequent investment under-performance. A plausible approach to improving this is to restrict the least skilful investors. I investigate an intervention which includes a mandatory assessment of investment knowledge and experience. I study the empirical relationship between investors’ actual investment portfolio outcomes, and their assessment results. Those assessed as “competent” made fewer mistakes, as benchmarked by a range of normative models. I show that the assessment is able to weakly screen out unskilled investors. However, the intervention’s high misclassification rate, under an analysis favorable to the scheme, highlights the challenges of this approach.