Week 6 Discussion — Biggest or Fairest: What Should a Market Deliver? — Traditional alternative (no AI)

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

Hook

A used bicycle sells for 60 dollars, three people ride away happy, and a fourth person who wanted one walks home without it. This week you learned to measure the gains from those trades and to show that, in the model, the market makes the total gain as large as it can be, so you can now argue about whether "as large as it can be" is what we should want.

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: On the course's illustrative used-bicycle ladder, five buyers value a bicycle at 100, 80, 70, 50, and 30 dollars and five sellers have costs of 20, 30, 50, 70, and 90 dollars. At a price of 60, three bicycles sell, buyers gain 70 dollars, sellers gain 80, and total surplus is 150 dollars, the most any number of trades can produce. The buyer who values a bicycle at 50 dollars goes without. One view holds that this outcome is a good one: every trade that creates value happens, nobody is forced to trade, and the price does the sorting without anyone in charge. Another view holds that efficiency is not enough: willingness to pay reflects how much money a buyer has as well as how much they want the good, so the market may serve the well-off first. Which view do you find more convincing, and why? Keep your positive claims (what the ladder shows) apart from your normative ones (what ought to happen).

Option B: Choose a market you or your community know well, such as concert tickets, rideshares at a busy hour, a popular class section, or a weekend farmers' market. Describe in words who gains there, buyers or sellers, and roughly where the gains come from, using willingness to pay, willingness to sell, consumer surplus, and producer surplus. Then argue whether that market's outcome is one your community should be glad of, or whether something about who gets the goods troubles you even if the market is efficient. Label which parts of your answer are positive claims and which are normative judgments, and say what evidence would change your mind. Do not invent prices or statistics; describe what you know firsthand.

There is no single right answer. Reasonable people weigh the size of the gains against how they are shared 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 which view you find more convincing, using the ladder's numbers (70 dollars to buyers, 80 to sellers, 150 in all, and the buyer at 50 who goes without); for Option B, name the market and say in one clear sentence who gains there and why.
• 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 (willingness to pay, willingness to sell, consumer surplus, producer surplus, total surplus, efficient number of trades, allocative efficiency, equity) correctly.
• Label at least one of your claims as positive (what the market does) and at least one as normative (what ought to happen).
• 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: point out where a post treats "efficient" as if it meant "fair", check whether a gain was given to the right side of the market, 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: at 60 dollars the ladder's three trades create 150 dollars of total surplus, 70 to buyers and 80 to sellers, and no other number of trades creates more. The normative part: I think that outcome is a good one, because nobody is forced to trade and every trade helps both sides. The strongest objection is that the buyer at 50 may want a bicycle as much as anyone but have less money. I accept that willingness to pay mixes wanting with having, so I would call the outcome efficient first and fair only after asking who the buyers are.

Notice how it keeps the size of the gain apart from its split, labels the positive and the normative parts, and gives the other side its strongest form. Someone who argued against the market's outcome 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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