“…Equation (1) shows the production function. (Mera, 1973;Da Silva Costa et al 1987;Bergman and Marom, 1993;Harmatuck, 1996;Sturm et al 1999;Njoh, 2000;Ghafoor and Yorucu, 2002;HerranzLoncan, 2007). On the other hand, the production function can be defined differently, as in equation (2) (Ratner, 1983;Aschauer, 1989;Ram and Ramsey, 1989;Munnell and Cook, 1990;Tatom, 1993;Garcia-Mila et al 1996;Pereira and Andraz, 2005 …”