“…The single item measures both, whether one perceives and the degree of that perception. In addition, the singleitem measure has been used in numerous previous studies (e.g., Attia et al, 1999;Barnett and Valentine, 2002;Marta et al, 2003;Rawwas and Singhapakdi, 1998;Singhapakdi et al, 1994Singhapakdi et al, , 1999Singhapakdi et al, , 2000aSinghapakdi et al, , b, 2001, implying strong reliability across many different sample populations. (Several other relationships were explored including independent variables of income and years of education, neither of these or other variables were found to be correlated with PEP, nor were the coefficients or levels of significance of Table III found to vary when these variables were included.)…”