“…Bierwag et al (1993) showed that among matching duration portfolios, the inclusion of a maturity matching bond works best empirically. Balb a as and Ib a añ nez (1998) illustrated with examples that the matching duration portfolio that minimizes theÑ N measure usually requires a matu-2 For instance, parallel shifts or other non-parallel shifts (Bierwag, 1977;Chambers et al, 1988;Prisman and Shores, 1988), shifts in an equilibrium models context (Cox et al, 1979;Brennan and Schwartz, 1983), or empirically estimated shifts (Litterman and Scheinkman, 1991;Chance and Jordan, 1996;and others). Furthermore, most of these strategies require no short selling constraints.…”