Perlewitz is only correct with respect to Comment 3. With 1/n diversification, where a DC plan participant divides his investment dollars equally across available investment options, diversification is by chance only and is not part of a total portfolio perspective. Such a diversification methodology is reflective of naïve diversification. The other comments are incorrect. An investor whose decisions are impacted by mental accounting will look at investments as separate, focusing on the risk of investments in isolation. This means that the investor dismisses the effects of correlation, thus leading to more risky portfolios than an investor who does consider correlation. Note that the disposition effect refers to holding on to losing investments too long and selling winners too soon. Finally, diversification from an efficient perspective may allocate investments in tax-deferred accounts (like a retirement plan) differently than investments in taxable accounts, while still focusing on the investor’s allocation as a whole. |
