Week 4 Discussion — When the Price Jumps: Signal or Burden? — Traditional alternative (no AI)

Instructors: publish this instead of the adaptive version if you prefer, and unpublish or delete the adaptive one.

Hook

A price jumps at the market and everyone has a theory: the seller got greedy, buyers went wild, or something happened to the supply. This week you learned to name the curve that moved, its direction, and where the new price and quantity land, so you can now argue about what a price change means and what anyone should do about it.

Your discussion question — choose Option A or Option B; they carry the same weight and the same rubric, and you say which you picked.

Option A: After a late frost cuts a farm stand's strawberry harvest, the stand raises its price per basket and still sells out by midday. One view holds that the higher price is doing a useful job: it shows growers elsewhere where berries are most wanted, and it sends the scarce baskets to the buyers who want them most. Another view holds that it is unfair to regular customers, and that the stand should keep its old price and let the berries go to whoever arrives first, even though a line forms and some people leave with none. Which view do you find more convincing, and why? Test your answer on the course's illustrative market, where a fall in supply moves the equilibrium from 6 dollars and 30 units a day to 7 dollars and 20 units, and where a price held below equilibrium leaves buyers wanting more than sellers offer.

Option B: Choose a good or service whose price you have seen jump or fall, such as gasoline, eggs, concert tickets, rideshares, or a local rent. Make the case for which curve moved (demand, supply, or both), name the determinant, and give the direction. Then say what one piece of evidence would show which curve really moved, and what one decision maker, such as a buyer, a seller, or a city office, should do about the change. Label which parts of your answer are positive claims (what moved and why) and which are normative judgments (what someone ought to do).

There is no single right answer. Reasonable people weigh what a price signals against who it burdens, and one cause against another, in different ways. Pick the one you actually care about, and tell us your reasoning.

Expectations

Activity format: one initial post followed by two substantive peer replies. Plan on about 45 minutes across the two deadlines; your instructor sets both due dates in Canvas.

Your initial post — by the first due date (early in the module week):

• Say which option you chose.
• For Option A, say whether you find the higher strawberry price more convincing as a useful signal or as an unfair burden, and test it on the course's market (a fall in supply moves the equilibrium from 6 dollars and 30 units to 7 dollars and 20 units, and a price held below equilibrium leaves a shortage); for Option B, name the good, the curve you think moved, the determinant, and the direction in one clear sentence.
• Give the strongest version of the view you disagree with in one or two sentences, and say why you still hold your position or what part of the other view you accept.
• Use at least two of this week's terms (law of supply, quantity supplied, supply, shift of the supply curve, determinants of supply, market equilibrium, shortage, surplus, comparative statics, simultaneous shifts) correctly.
• Label at least one of your claims as positive (what moved and why) and at least one as normative (what someone ought to do).
• Length: roughly 150–250 words if written. You may instead record your post as audio or video (about two minutes) and attach a transcript; both forms are scored by the same rubric.

Your replies — by the second due date (the end of the module week):

• Reply substantively to at least two classmates.
• A substantive reply does more than agree: ask whether the post named the right curve, point out a shortage called a surplus or a shift drawn the wrong way, check whether both curves could have moved, or argue the other side of the question at its strongest. "Nice point!" on its own does not count.

What a strong post looks like:

I chose Option A. The positive part: the frost is a fall in supply, not in demand, so in the course's market the equilibrium moves from 6 dollars and 30 units to 7 dollars and 20 units, and if the stand held its old price, buyers would want more baskets than it had. The normative part: I think the higher price is fairer than a line, because people who need the berries most can still get them. The strongest objection is that a price rationing by money favors buyers with more of it. I accept part of that, but a first-come line favors buyers with free mornings.

Notice how it names the curve and the direction before it judges, labels the positive and the normative parts, and gives the other side its strongest form. Someone who argued for keeping the old price as carefully would meet the same bar.

Participation rubric

This discussion is worth 10 points. The three criteria below look at your initial post and your peer replies.

Post early if you can — the best threads happen when people have time to reply before the second due date.

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