Chapter 1 — Teaching Notes
What this chapter is doing
Chapter 1 has an unusual job: it must simultaneously establish the book's central technical concept (prime cost) and establish its epistemic posture — that numbers get checked. The failure-rate correction in §1.1 is not a digression. It is a demonstration, on the first page, of the discipline the rest of the course demands.
Teach it that way. If students come out of this chapter believing only that "the 90% figure is wrong," you have taught trivia. If they come out believing that confidently repeated industry numbers require verification, you have taught the course.
Timing
- A 75-minute session: §1.1 (15 min) → §1.2 with Figure 1.3 worked live (25 min) → §1.3 prime cost with the A/B comparison (25 min) → §1.7 revenue arithmetic (10 min). Assign §1.4–1.6 as reading.
- Two sessions: split at the end of §1.3. Session two opens with the four failure mechanisms and spends real time on §1.6, which students consistently underweight.
- Self-paced: 5–7 hours including exercises.
Common misconceptions
1. "Prime cost is just food cost plus labor cost, so watching them separately is the same thing." It is not, and this is the single most important correction in the chapter. Separate monitoring misses the trade between them. Use the A/B comparison in §1.3 (26/39 vs. 32/30) — it lands hard because Restaurant A's food cost looks so good. Ask the class which operator they would rather be before revealing the prime cost line.
2. "A restaurant with a full dining room is doing well." Students find this genuinely difficult. Volume feels like success. Work a numerical example: take the Figure 1.3 restaurant, increase covers 20%, and show that at 65% prime cost the additional volume produces additional losses on every incremental cover if prime cost is above the point where contribution turns negative. The phrase to leave them with: volume cannot fix a margin problem.
3. "Food cost is invoices divided by sales." Extremely common, including among students who have
worked in restaurants — often especially among them, because it is what they saw their manager do.
The ⚠️ Where the Money Leaks box in §1.3 addresses it, but it needs reinforcement. Preview the
usage formula and tell them Chapter 13 makes it operational.
4. "Correcting the failure statistic means restaurants are safer than people think." Students reliably draw this conclusion and it is the opposite of the point. Push back immediately. The correct reading is that the risk has a different shape — gradual rather than sudden — which makes it both more preventable and, for an unprepared operator, more insidious.
5. Confusing the construction contingency with the working-capital reserve. They are different money for different purposes and students merge them constantly. Worth putting on the board as two separate boxes.
The hardest point to teach
Operating leverage, before students have the vocabulary for it.
§1.7's four-variable revenue estimate contains the whole idea: a 0.2 change in turns produces $167,440 of annual revenue on a business whose entire profit is around $85,000. Students can do the arithmetic and still not feel it, because they have no intuition for a four-point margin.
What works: make them compute the same sensitivity on a business with a 40% margin. Show that a $167,440 revenue swing on a high-margin business is pleasant, and on a restaurant it is the difference between a good year and closing. The concept only lands by contrast. Chapter 32 formalizes it; Chapter 1 needs them to feel it.
A demonstration that works
The P&L reconstruction. Put the Figure 1.3 statement on the board with the food cost line blank. Give students the revenue split and a 30% food-cost target and have them compute what should have happened. Then reveal 34.5%.
The moment when a room full of students realizes that a single line, four and a half points off, consumed more than half the profit of a restaurant everybody loved — that is the moment the course starts. Do not rush it. Let them sit with the arithmetic.
Extension if you have time: ask them to list every possible cause of the overage before you mention any. They will say "theft" first, almost universally. Then work Exercise 1.26's ranking, which shows theft is both the least likely and the slowest to investigate. This inoculates them against a bias that will otherwise follow them into Chapter 34.
Assessment notes
- Exercises 1.9, 1.12, 1.14, and 1.16 are the computational core. If a student can do those four, they can follow the rest of the book.
- Exercise 1.22 is the best single diagnostic: it requires the revenue estimate, notices the shortfall against the plan figure, and asks where the gap comes from. Students who spot that the two sources together overshoot are reading well.
- Exercise 1.30 (the investor note) is the best writing prompt in the chapter and works well as a graded short assignment. Look for whether they resist the temptation to use the correction as reassurance.
- Exercise 1.28 rewards students who refuse the question as posed and diagnose first. Reward that.
Connections forward
Flag these explicitly so students build the map early: prime cost → Chapters 11, 19, 31. The four mechanisms → Chapters 5 (capital), 11/13 (drift), 19 (labor), 33 (cash). Service styles → Chapter 2's concept work. The second-visit argument → Chapter 23. Operating leverage → Chapter 32.