Should your bank invest for you? Evidence from private banking accounts

Abstract

We analyze a large dataset of private banking portfolios in Switzerland of a major bank with the unique feature that parts of the portfolios were managed by the bank, parts were advisory portfolios. To correct the heterogeneity of individual investors, we apply a mixture model and a cluster analysis. Our results suggest that there is indeed a substantial group of advised individual investors that outperforms the bank-managed portfolios, at least after fees. However, a simple passive strategy that invests in the MSCI World and a risk-free asset significantly outperforms both the better advisory and the bank-managed portfolios.