“…Two approaches to measure preference under varying schedule arrangements have been used: the matching principle (Herrnstein, 1970), and behavioral economic approaches (Hursh, 1984;Morgan & Tustin, 1992;Rachlin, Battalio, Kagel, & Green, 1981;Tustin & Morgan, 1985). Both Neef, Mace, Shea, and Shade (1992) and L. Green and Freed (1993) noted that, although the matching principle is applicable when alternative reinforcers are qualitatively similar, its ability to predict choice 597 19942271,597-606 NUMBER4 (wmm 1994) between qualitatively different reinforcers may be limited.…”