Buddha denounced the caste system and taught that a person's actions are the measure of who a person is, whether a priest or outcast. He denounced the authority of Brahmin priests, their scripture and their rituals. He welcomed outcasts and some of the greatest tantric adepts were from the lowest caste (buddhanet.net).
I believe the answer is: universal principles
Universal principles refers to a set of principles that would mostly applicable to the majority of human being regardless of their background and environment.
Example of ethical decision based on universal principles would be not causing any physical harm to people unless you are in a self defense sitaution. This can be created because most people universally would not like being physically hurt.
