Values should be evaluated based on the comparison between the cost and the benefit of each value.
That which provides the greatest happiness for the greatest number of people is the best course of action. (Jeremy Bentham / John Stewart Mill)
This standard contends that the most urgently needed, or most threatened value, as publicly recognized, is the higher value in any given situation.
Always act on that value (maxim) which can be made a universal law of conduct. (Immanuel Kant)
The meaning and truth of thought is determined by usefulness and practical consequences.