Week 3 — Quiz · Demand
Course: Principles of Microeconomics (ECON 1) · Silver Oak University (fictional sample) · Prof. Kessler
Objective 2 · 10 questions · 10 points · closed to AI · one attempt
Auto-graded (Classic QTI): see F-quiz-week-03-qti.xml for the Canvas import. Every numeric answer is pre-computed; every curve/shift claim is verified.
Note: the quiz uses a FRESH demand equation (Qd = 90 − 6P) so that the quiz is not simply copying the workshop numbers. Every value below is pre-computed and independently verified.
The questions (human-readable; answer key below)
Q1. The law of demand states that, all else equal —
A) quantity demanded rises when price rises B) quantity demanded falls when price rises C) income and quantity demanded move in the same direction D) demand shifts left when income falls
Q2. A demand schedule shows —
A) the maximum price a seller will accept B) a list of price-quantity combinations that buyers are willing and able to purchase C) total spending by households in the economy D) how supply changes as price falls
Q3. Use the demand schedule Qd = 90 − 6P. At a price of $8, the quantity demanded is —
A) 42 B) 48 C) 60 D) 82
Q4. (Continues Q3) At a price of $12, the quantity demanded from Qd = 90 − 6P is —
A) 9 B) 12 C) 18 D) 24
Q5. Coffee's own price rises. In the coffee market, this causes —
A) the demand curve for coffee to shift left B) the demand curve for coffee to shift right C) a movement along the demand curve for coffee (quantity demanded falls) D) no change, because demand depends only on income
Q6. Which of the following would cause a right shift (increase) of the demand for new cars? (Assume cars are a normal good.)
A) The price of new cars falls B) Consumers' incomes rise C) The price of gasoline (a complement) rises D) People begin preferring public transit over driving
Q7. (Select all that apply.) Which of the following are determinants that can SHIFT the demand curve?
A) A change in the price of the good itself B) A change in buyer income C) A change in the price of a substitute D) A change in consumer tastes E) A change in expectations about future prices
Q8. (True/False) A rise in the price of tea (a substitute for coffee) will shift the demand curve for coffee to the right.
→ True (correct answer)
Q9. (Matching) Match each event to its correct effect on the demand for butter.
| Event | Effect |
|---|---|
| Incomes rise; butter is a normal good | ___ |
| The price of margarine (a substitute for butter) rises | ___ |
| Health recommendations discourage saturated fat | ___ |
| Expectations that butter prices will rise next month | ___ |
Choices: Demand shifts right (increase) · Demand shifts right (increase) · Demand shifts left (decrease) · Demand shifts right (increase)
Q10. The price of video game consoles rises significantly. The MOST LIKELY effect on the demand for video games (a complement) is —
A) no change — complementary goods are unrelated B) the demand for video games shifts right C) the demand for video games shifts left D) the quantity demanded of video games falls along the curve
Answer key & feedback (instructor)
| Q | Type | Answer | Feedback (the idea) |
|---|---|---|---|
| 1 | MC | B | The law of demand: ↑P → ↓Qd. Own-price and quantity demanded move in opposite directions. |
| 2 | MC | B | A demand schedule lists (P, Qd) pairs — the relationship at many prices. |
| 3 | MC | A | Qd = 90 − 6(8) = 90 − 48 = 42. Verified. |
| 4 | MC | C | Qd = 90 − 6(12) = 90 − 72 = 18. Verified. |
| 5 | MC | C | The good's own price changes → movement along the demand curve, NOT a shift. |
| 6 | MC | B | Rising income for a normal good → right shift of demand. (A) = movement along; (C) and (D) = left shifts. |
| 7 | MA | B, C, D, E | (A) is wrong — own-price changes cause movement along, not a shift. The other four are determinants. |
| 8 | TF | True | Tea is a substitute for coffee; ↑P(tea) → demand for coffee shifts right. |
| 9 | Match | See below | Income↑ → right; Psubstitute↑ → right; Tastes↓ → left; Expect P↑ → right. |
| 10 | MC | C | Complements: ↑P(consoles) → ↓demand for games (left shift). Note: the curve shifts, not just a movement along. |
Q9 matching key:
- "Incomes rise; butter is a normal good" → Demand shifts right (increase)
- "Price of margarine rises" → Demand shifts right (increase)
- "Health recommendations discourage saturated fat" → Demand shifts left (decrease)
- "Expectations that butter prices will rise next month" → Demand shifts right (increase)
Quality gate (self-checked): Q3 (90−48=42) and Q4 (90−72=18) re-computed in Python ✓; every shift direction verified — Q6(B) income↑ for normal good → right ✓; Q7 own-price does NOT shift the curve ✓; Q8 substitute price↑ → demand for other good shifts right ✓; Q10 complement price↑ → demand for complement good shifts LEFT ✓. No free numeric entry.
F-quiz-week-03-qti.xml) ships inside the course's .imscc package — it lands in the Canvas gradebook on import.~ Prof. Kessler's edition · Fall 2026 · built with thecoursemaker.com