Positive economics takes an objective, fact-based approach to describe economic phenomena and relationships, focusing on what is. Normative economics takes a more subjective approach focused on what should be based on values and opinions. Positive economics deals with quantifiable, measurable descriptions and causes/effects, while normative economics involves value judgments and idealized prospective situations that cannot be scientifically tested or proven. Both have important roles to play, with positive economics providing objective analysis and normative economics introducing new ideas, but decisions should be based on the factual findings of positive economics.