Final answer:
The principle espoused by one of the major philosophical systems is known as the universal law formulation of the categorical imperative. This principle was developed by the philosopher Immanuel Kant and it states that individuals should act only according to a maxim (rule for acting) that they can will to become a universal law.
Step-by-step explanation:
The principle espoused by one of the major philosophical systems is known as the universal law formulation of the categorical imperative. This principle was developed by the philosopher Immanuel Kant and it states that individuals should act only according to a maxim (rule for acting) that they can will to become a universal law. This means that an action is considered moral if it can be applied universally for all rational beings.