This paper examines the relationship between overconfidence and losses from under-diversification among Dutch investors. We find that a lack of proper portfolio diversification is positively associated with overconfidence. Part of this relationship is mediated through the lower propensity of...

Portfolio selection has been in the focus of financial research for at least thirty years. With a hand-collected data set containing information about the portfolio structure of private and institutional investors our paper gives a brief literature review and sheds light on the home bias effect...