“…Issues related to the dependence of the frontier on fixed inputs had been discussed in the literature on interfirm and intrafirm production functions and related issues, Reder (1943), Bronfenbrenner (1944), Smith (1945), and more recently formulated for empirical analysis in the form of the Putty-Clay production functions (Fuss 1977 "Thus defined, the metaproduction may appear to be the same as the innovation possibility curve advanced in Figure 4-2 in the previous chapter. In fact, we consider the metaproduction function an operational definition of the innovation possibility curve-operational in the sense that it can be measured empirically from observable production data.…”