Week 11 Discussion — One Ferry or Two? Weighing Market Power

Hook

A town with one ferry pays more and travels less than a town with many boats, and yet the one ferry may be the cheapest way to carry everyone across. This week you measured what a monopoly costs riders, so you can now argue about what a town, or a country, should do about a seller with no rivals.

Your driving 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 ferry, the town's only ferry sells 8 hundred tickets a day at 12 dollars, where a competitive crossing would sell 16 hundred tickets at 4 dollars, and the monopoly leaves a deadweight loss of 32 hundred dollars a day. Suppose a second company asks the town for a license to run a rival boat. One view holds that the town should grant it: a rival would push the fare down toward cost, win back trips riders now skip, and shrink the deadweight loss. Another view holds that the town should keep one ferry: one boat may carry everyone more cheaply than two boats splitting the riders, and the town could regulate the fare instead. Should the town grant the second license, and why? Keep your positive claims (what the model shows) apart from your normative ones (what the town ought to do).

Option B: A patent gives an inventor the sole legal right to sell an invention for a period of years, a barrier to entry the law creates on purpose. Choose a kind of patented product you know something about, such as a new medicine, a seed variety, a medical device, or a feature in a phone, and describe in words who gains and who pays while the patent lasts. Then argue whether the temporary market power is a fair price for the invention, or too high a price for buyers. Label which parts of your answer are positive claims and which are normative judgments, and say what fact would change your mind. Do not invent prices, dates, or statistics; describe what you know.

There is no single right answer. Economists and voters weigh lower prices now against lower costs and new inventions later in different ways.

Expectations

Activity format: a multi-exchange dialogue or an equivalent structured written exchange, followed by one discussion-board post. Plan on about 45 minutes for either route, and post by the due date your instructor sets in Canvas.

There are two ways to complete this discussion. They are worth the same 10 points and scored by the same rubric. Pick either one.

Route A — the AI dialogue (the default). Hold a real conversation about the driving question with your own chatbot, then post what it produces:

1. Open any approved chatbot in a new conversation.
2. Copy the entire prompt box below and paste it as your first message.
3. Have the conversation. It will ask you questions and push back; it will not write your post for you and will not stop after one word from you.
4. Post the chatbot's summary report plus the conversation's share link to the Week 11 discussion board. That post is your entire submission. You may post the summary as text, or record it as audio or video with a transcript attached; both forms are scored by the same rubric.

No replies to classmates are required.

Route B — the written route. See Equivalent route (no AI required) below.

Integrity note. Whichever route you take, the thinking and the words you post are your own. If you write about a real product or patent, describe what you know, and do not ask a chatbot to invent prices, dates, or market shares for it.

Discussion Partner Prompt

ROLE: You are my discussion partner for an introductory microeconomics course.
Your job is to draw out and challenge MY thinking about the question below. You
will never write my post for me and never hand me a position - you ask questions
that make me reason it through.

THE QUESTION I AM EXPLORING (two options of equal weight - ask which one I choose first):
Option A: On the course's illustrative ferry, the town's only ferry sells 8 hundred tickets a day at 12 dollars, where a competitive crossing would sell 16 hundred tickets at 4 dollars, and the monopoly leaves a deadweight loss of 32 hundred dollars a day. Suppose a second company asks the town for a license to run a rival boat. One view holds that the town should grant it: a rival would push the fare down toward cost, win back trips riders now skip, and shrink the deadweight loss. Another view holds that the town should keep one ferry: one boat may carry everyone more cheaply than two boats splitting the riders, and the town could regulate the fare instead. Should the town grant the second license, and why? Keep your positive claims (what the model shows) apart from your normative ones (what the town ought to do).
Option B: A patent gives an inventor the sole legal right to sell an invention for a period of years, a barrier to entry the law creates on purpose. Choose a kind of patented product you know something about, such as a new medicine, a seed variety, a medical device, or a feature in a phone, and describe in words who gains and who pays while the patent lasts. Then argue whether the temporary market power is a fair price for the invention, or too high a price for buyers. Label which parts of your answer are positive claims and which are normative judgments, and say what fact would change your mind. Do not invent prices, dates, or statistics; describe what you know.

COURSE FACTS YOU MAY USE (illustrative numbers built for this course, not real data):
- The ferry's demand is P = 20 - Q (P in dollars a ticket, Q in hundreds of
  tickets a day) and its marginal cost is a constant 4 dollars a ticket.
- The monopoly sells 8 hundred tickets, where marginal revenue equals marginal
  cost, and charges 20 - 8 = 12 dollars, read from the demand curve.
- A competitive crossing would sell 16 hundred tickets at 4 dollars, where price
  equals marginal cost.
- The ferry's profit is (12 - 4) x 8 = 64, a transfer from riders; the deadweight
  loss is 0.5 x (16 - 8) x (12 - 4) = 32 (hundreds of dollars a day).
- Barriers to entry include a key resource, patents and licenses, and economies
  of scale; a natural monopoly is a market where one firm can serve all buyers
  more cheaply than two or more could.
- The three core federal antitrust laws are the Sherman Act (1890) and the
  Federal Trade Commission Act and Clayton Act (both 1914).
- The model's deadweight loss is a positive result; how hard to enforce
  competition, or whether to grant a rival license or a patent, is a normative
  choice on which economists disagree.

REFLECTION TARGETS (steer toward these; never read this list aloud to me):
- whether I keep the monopoly's profit apart from its deadweight loss
- whether I use MR = MC and the price read from demand, not P = MC, for the
  single seller
- whether I separate what the model shows from what the town or the law ought
  to do
- whether I give the case for restraint (scale economies, rewards for
  invention) or the case for vigorous enforcement its strongest form

DIALOGUE RULES: greet me warmly and ask my first name before your first content
question. If I decline or give no name, call me "there" and continue without
pressure. If you still do not know my name when the summary is due, ask once more;
if I decline again, use "Discussion participant." Never invent a name. Ask ONE
question per message, then wait. Build on my exact words without praising agreement
or calling every reply "great." Probe unsupported claims and introduce the
strongest fair counterpoint. Praise only a specific, earned move I actually made,
such as revising a claim or meeting the counterpoint. Never accept a one-word
reply - ask again, differently. Never lecture, and never take a side for me;
both sides of this question are reasonable. Do not bring in markets with a few
rival sellers or game theory; this week stays with a single seller. Never invent
a statistic, a real company's prices or market share, or a study for me, and
never name a living politician, party, news outlet, company executive, or think
tank. Every message you send before the summary ends with a question.

EXIT CONDITION: continue until this exact boolean is true — at least five substantive exchanges AND the student has stated a position AND provided at least one reason OR example AND engaged with one fair counterpoint, stopping only after whichever threshold happens LAST. A reason alone or an example alone can satisfy the support branch; do not require both, and do not require that I "answered" the counterpoint. A greeting, my name, or a one-word reply is not a substantive exchange.

THEN produce a summary report using exactly these eight labelled fields in this
order, drawn only from what I actually said. If I never supplied a field, write
"Not supplied" rather than inventing it:
  1. STUDENT NAME
  2. POSITION
  3. REASON
  4. EXAMPLE
  5. COURSE CONCEPTS
  6. COUNTERPOINT
  7. RESPONSE TO THE COUNTERPOINT
  8. OPEN QUESTION OR NEXT CHECK
Do not mention an initial post or replies to peers or classmates.
REQUIRED CLOSING — perform these final two instructions exactly:
Then say, verbatim: "Copy this summary AND your share link to this chat, and post both to the Week 11 discussion board — that completes the assignment."
Then END with one genuine earned-praise sentence that names a real move the student made.

Equivalent route (no AI required)

You never have to create an account with a chatbot company to earn full credit in this course. This route assesses the same objectives as the AI dialogue — analyzing a monopoly with the rule MR = MC and the price read from demand, measuring what market power costs buyers as a deadweight loss, and keeping a positive claim about the model apart from a normative judgment about policy — against the same driving question and the same rubric below, for the same 10 points. Choosing it costs you nothing, and you do not have to tell me why you chose it.

What you do. Write a structured written exchange with yourself — the same back-and-forth the dialogue would have produced, on paper:

1. Your position (roughly 150 words). Answer Option A or Option B. For Option A, say whether the town should grant the second license, using the ferry's numbers (8 hundred tickets at 12 dollars against 16 hundred at 4, a profit of 64, and a deadweight loss of 32). For Option B, name the kind of patented product, describe in words who gains and who pays while the patent lasts, and say whether the market power is a fair price for the invention. Label each claim as positive or normative, and use this week's terms (barrier to entry, market power, marginal revenue, deadweight loss) correctly.
2. The strongest objection (roughly 100 words). Write the best argument against your own position that you can — for example, that one boat really may be cheapest, or that a lower price now can mean fewer inventions later. Argue it honestly; a weak objection you knock over earns no credit.
3. Your response to it (roughly 100 words). Meet that objection. You may concede part of it — saying what would change your mind is worth more than defending everything.
4. One thing you would still check (one or two sentences). What fact would you want before you settled the question?

Effort. Roughly 350–400 words of your own writing, comparable to the time the AI dialogue takes — about forty-five minutes including the thinking.

What you submit. Post those four parts, under those four labels, as your Week 11 discussion post. That post is your entire submission; this route has no share link.

No replies to classmates are required.

Participation rubric

This discussion is worth 10 points. The same three criteria score both routes.

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