Week 4 Discussion — Capital, Skills, or Ideas? — Traditional alternative (no AI)
Instructors: publish this instead of the adaptive version if you prefer, and unpublish or delete the adaptive one.
Hook
Two places can start with the same output and end a working lifetime apart: in this week's illustrative numbers, 100 billion dollars grows to about 121.90 billion in ten years at 2% but to about 196.72 billion at 7%. What decides which path a place is on is mostly what raises output per worker, and that is where people genuinely disagree.
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: Think of a job, a workplace, or a field you know or plan to enter. Which of the three sources of growth (physical capital, human capital, or technology) has done the most to raise output per worker there, and which one would do the most from here on? Take a position, give a reason or an example, and label which part of your claim is positive (testable against evidence) and which part is normative (a judgment about what ought to happen).
Option B: A country has one extra dollar of public money to spend on raising living standards over the long run. Should it put that dollar mainly into physical capital, such as roads and equipment, or mainly into human capital, such as schools and job training? Take a position, use the rule of 70 or compound growth to explain why the choice matters over decades, and present the strongest case for the other side.
There is no single right answer. Physical capital, human capital, and technology can each be argued well as the lever that matters most in a given place, and economists weigh the trade-offs differently. Your job is to take a position, support it with this week's tools, and keep what the model predicts (positive) separate from what you think ought to be done (normative). Pick the option 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, name the field, the source of growth that has mattered most there, and the one you expect to matter most next; for Option B, state in one clear sentence whether physical capital or human capital should get the dollar.
- Use at least two of this week's terms (economic growth, growth rate, rule of 70, compound growth, real GDP per capita, per-capita growth, productivity, physical capital, human capital, technology, Solow growth model) correctly.
- Give your reason, use the rule of 70 or compound growth where it fits, and label which sentences are positive and which are normative.
- 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: make the strongest case for a source of growth the poster set aside, check whether a doubling time is treated as an approximation, or point out a normative claim presented as if it were positive. "Nice point!" on its own does not count.
What a strong post looks like:
I chose Option A, for hospital nursing. Positive claim: better equipment, such as monitors that chart vital signs automatically, has raised how many patients each nurse can care for safely. Normative claim: from here on, training should come first, because new equipment helps only when staff know how to use it. The strongest objection is that training is slow to pay off. I partly agree, but a skill keeps paying off for a whole career, and small gains compound over time.
Notice how it names the field and a source of growth, labels the positive and the normative claims, and answers an objection. That is the bar.
Participation rubric
This discussion is worth 10 points. The three criteria below look at your initial post and your peer replies.
| Criterion | Strong | Developing | Missing |
|---|---|---|---|
| Quality of the initial post (4 pts) | A clear position is stated, tied to output per worker and a named source of growth, with a reason or example that shows how the choice plays out over time | A position is present, but the link to productivity or to the long run is asserted without a reason | Missing, off-topic, or no reasoning about growth |
| Use of course concepts (3 pts) | Uses this week's terms precisely, treats the rule of 70 as an approximation, and labels positive and normative claims | Uses a term loosely, or mixes a positive claim with a value judgment without saying so | No course terms, or used incorrectly |
| Engagement with peers (3 pts) | Two or more substantive replies that extend or fairly challenge a classmate's reasoning | One substantive reply, or replies that only agree | No replies, or "I agree" with nothing added |
Post early if you can — the best threads happen when people have time to reply before the second due date.
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