According to Al-Rodhan, the risk of this aggression and the resulting brutality should be minimized through confidence-building measures and policies that promote inclusion and prevent anarchy.  How many behaviors can aggression be studied based on its ability to help an animal itself, survive and reproduce, or risk survival and reproduction? This cost-benefit analysis can be seen from the perspective of evolution. However, there are profound differences in the acceptability of a biological or evolutionary basis for human aggressiveness.  Intercultural research has found differences in attitudes towards aggression in different cultures. In a questionnaire about university students, respondents in the United States justified physical assaults on the defensive more easily than Japanese or Spanish respondents, while Japanese students preferred direct (but not indirect) verbal aggression more than their American and Spanish counterparts.  In American culture, a study of college students showed that southerners are more affected and more aggressive than northerners when insulted after being pushed, which is theoretically linked to a traditional honor culture in the southern United States or “face preservation.”  Other cultural subjects, sometimes applied to the study of aggression, are individualistic versus collectivist styles, which may relate, for example, to the question of whether disputes are accommodating to open competition or by responses and avoid conflicts. In a study conducted in 62 countries, school leaders more often reported aggressive student behaviour than the more individualistic and therefore less collectivist culture in their country.  Other comparisons of aggression or war include democratic and authoritarian political systems and egalitarian societies towards stratified societies.  The economic system known as capitalism was seen by some as dependent on the use of human competitiveness and aggression in the pursuit of resources and trade, which was viewed both positively and negatively.