How Economists Separate What Happened From What Should Happen
Positive economics asks questions that evidence can help answer: what changed, how two things are related, and what might happen under specified conditions. A business might want to know whether raising a price reduced the number of items sold. Researchers can compare sales before and after the increase, or compare them with sales at similar businesses that did not change prices.
The comparison matters because sales can fall for other reasons, such as a seasonal slowdown or a new competitor. To argue that the price change caused the decline, an economist must account for plausible alternative explanations. That requires choosing useful evidence and making assumptions; “positive” does not mean that every result is obvious or free from uncertainty.
Where Values Enter the Discussion
A positive finding describes or predicts an outcome. It does not, by itself, say whether that outcome is desirable. If a price increase raises a company’s revenue but makes a product harder for some customers to afford, deciding whether the tradeoff is acceptable involves judgments about whose interests matter and how they should be weighed.
Those judgments belong to normative economics, which concerns what ought to happen. The two kinds of reasoning often appear together in policy debates: evidence can estimate the likely effects of a tax or subsidy, while values shape whether those effects are worth pursuing.
Keeping the questions distinct makes disagreement clearer. People may dispute the evidence about what a policy will do, or agree on its effects but disagree about whether those effects are fair. Knowing which disagreement is at stake helps turn a broad argument into a question that can be examined or debated directly.
