Economics studies how people deal with scarcity (Scarcity and the Factors of Production). When economists speak, they sometimes describe how the economy works and sometimes say what they think should be done. Telling the two apart is the first step to a fair argument.
Key idea
A positive statement describes how the world is, was or will be. It can be tested against evidence, at least in principle, and it stays positive even if it turns out to be false. A normative statement says what ought to be. It rests on values and often uses words like should, ought, better, fair or too much.
Why it works
The split matters because the two kinds of disagreement are settled differently. If two people disagree about whether a soda tax cuts soda sales, data can settle it: that is a positive question. If they agree on the facts but disagree about whether the tax is worth it, evidence can inform them but not settle it, because they weigh goals (health, freedom of choice, the burden on low-income buyers) differently. That is why economists who agree on the facts can still disagree about policy.
Worked example: Three statements
Classify each: (a) "College graduates earn more on average than people with only a high school diploma." (b) "Reducing unemployment is more important than reducing inflation." (c) "Printing money always lowers prices."
- (a) Can data check it? Yes, with earnings surveys. Positive.
- (b) "More important" ranks goals; no data set can say which goal matters more. Normative.
- (c) This one is false (printing a lot of money tends to raise prices), but it makes a claim that evidence can test. Positive.
Answer: (a) positive, (b) normative, (c) positive (and false).
Common mistake
Calling a statement normative because you disagree with it, or positive because it sounds scientific or has numbers in it. "The tax rate on the highest earners should be 50 percent" is normative even though it has a number; "a \$30 minimum wage would end all poverty" is positive even though it is wrong. Check: ask "could evidence, at least in principle, prove this false?" If yes, it is positive. If it needs a judgment about what is good or fair, it is normative.
Throughout this course you'll see the same split. Where economists broadly agree on a positive question (for example, that a binding price ceiling causes a shortage), lessons say so. Where they disagree on facts that are still being studied, or on the values behind a policy, lessons lay out each side.