NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Hiroaki Sakaguchi

University of Warwick
Department of Psychology

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Institutional Affiliation: University of Warwick

NBER Working Papers and Publications

February 2019Naïve *Buying* Diversification and Narrow Framing by Individual Investors
with John Gathergood, David Hirshleifer, David Leake, Neil Stewart: w25567
We provide the first tests to distinguish whether individual investors equally balance their overall portfolios (naïve portfolio diversification—NPD) or engage in naïve buying diversification (NBD)—equally balancing values in same-day purchases of multiple assets. We find NBD in purchases of multiple stocks, and in mixed purchases of individual stocks and funds. In contrast, there is little evidence of NPD. So investors seem to narrowly frame their buy-day decision. Simulation analysis suggests that NBD substantially reduces investor welfare. These findings suggest that behavioral finance theory should incorporate transactional as well as portfolio framing.
 
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