The idea behind the scale is that human morality is the result of biological and cultural evolutionary processes that made human beings very sensitive to many different (and often competing) issues. Some of these issues are about treating other individuals well and respecting them as individuals (care, fairness, and autonomy). Other issues are about how to be a good member of a group or supporter of social order and tradition (loyalty, authority, and purity). Haidt and Graham have found that political liberals generally place a higher value on the care and fairness foundations; they are very concerned about issues of harm and fairness (including issues of inequality and exploitation). Political conservatives care about harm and fairness too, but they generally score slightly lower on those scale items. The big difference between liberals and conservatives seems to be that conservatives score slightly higher on the loyalty foundation, and much higher on the authority and purity foundations. Libertarians appear to score highly on the autonomy foundation and lower (relative to liberals and conservatives) on the other foundations.