Economics for Managers
Where value comes from, and who ends up capturing it.
Demand is the hardest thing a manager has to guess at, because the number that drives it — what a customer is actually willing to pay — is invisible. This module builds demand from that one primitive, adds the supplier side, lets the two meet in a market, and ends at strategy: where to play and how to win.
The question a manager brings to it: What should we charge, and where can we win?
What it lets you do
- Read a demand curve as a stack of willingness-to-pay, not a line on a chart
- Use elasticity to tell whether a price move gains or loses revenue
- Separate fixed, variable, sunk and opportunity costs — and know which ones belong in a decision
- Explain who captures the value a transaction creates, and why
Where it starts
Willingness to pay
Every pricing question eventually reduces to one number you cannot see: the most a given customer would hand over rather than walk away. That is willingness to pay, and it is not the price. A product can be free and still have people who would have paid a fortune for it; a product can be priced at $40 and have no one in the room willing to go past $30.
Price is observable. WTP is not. That asymmetry is the whole problem — and the reason companies spend real money on surveys, focus groups, auctions and experiments just to get a blurry read on it.
A demand curve is just your customers, sorted
Twelve people, twelve private numbers. Sort them highest to lowest and the staircase you get is the demand curve — there is nothing else in it.
Customers who buy
6
of 12
Revenue
$330
Value they keep
$113
WTP above the price they pay
Highest WTP in the room
$91
invisible to you in real life
- Enterprise
- Studios
- Freelance
Colour the same twelve people by segment and the reason to segment becomes obvious: Enterprise would have paid far more than you charged, and Freelance walked away from a price they were never going to meet. One price serves neither of them well.
Show the numbers
| Customer | Segment | Willingness to pay | At $55 |
|---|---|---|---|
| Omar | Enterprise | $91 | buys · keeps $36 |
| Kaito | Enterprise | $83 | buys · keeps $28 |
| Tomás | Enterprise | $77 | buys · keeps $22 |
| Noor | Studios | $70 | buys · keeps $15 |
| Ines | Studios | $64 | buys · keeps $9 |
| Wren | Studios | $58 | buys · keeps $3 |
| Ayo | Studios | $52 | walks away |
| Sofia | Studios | $46 | walks away |
| Priya | Freelance | $44 | walks away |
| Lena | Freelance | $38 | walks away |
| Idris | Freelance | $31 | walks away |
| Mira | Freelance | $25 | walks away |
The picture
The demand curve
Put price on the vertical axis and quantity on the horizontal, and the sorted stack of willingness to pay becomes a line. It slopes down for two separate reasons, and it is worth keeping them apart. For one person, the second unit is worth less than the first — diminishing marginal returns. Across a market, fewer people clear the bar as the price rises.
The demand curve is a stack of willingness to pay
Every buyer lined up highest to lowest. Move the price and the same line tells you volume, revenue and how much value customers keep.
Revenue is the shaded rectangle: price × quantity.
Quantity sold
30
units
Revenue
$2,100
Consumer surplus
$450
value buyers keep
Elasticity
2.33
Elastic
A price cut wins more volume than it gives up in margin.
- Demand
- Revenue (price × quantity)
- Consumer surplus
The same demand curve, as revenue
Show the numbers
| Price | Quantity | Revenue | Elasticity |
|---|---|---|---|
| $10 | 90 | $900 | 0.11 |
| $20 | 80 | $1,600 | 0.25 |
| $30 | 70 | $2,100 | 0.43 |
| $40 | 60 | $2,400 | 0.67 |
| $50 | 50 | $2,500 | 1.00 |
| $60 | 40 | $2,400 | 1.50 |
| $70 | 30 | $2,100 | 2.33 |
| $80 | 20 | $1,600 | 4.00 |
| $90 | 10 | $900 | 9.00 |
The number that decides
Elasticity
Slope tells you how steep a demand curve is, but slope changes if you switch from litres to gallons, which makes it useless for comparing across products. Elasticity fixes that by working in percentages: the percent change in quantity divided by the percent change in price. It is unit-free, so you can put two completely different products side by side.
Above 1, demand is elastic and volume reacts hard to price. Below 1, demand is inelastic and volume barely notices — which is why cigarettes absorb tax increases and jewellery does not.
Elasticity is a ratio of two percentage changes
The course's own example is loaded in: move the price from $60 to $80 and quantity falls by half. Drag either end to make up your own.
- Price
- $60 → $80 +33.3%
- Quantity
- 40 → 20 -50.0%
- Elasticity
- 1.50
Above 1: quantity moves proportionally more than price. Demand is elastic here, so raising the price costs you revenue.
Revenue before
$2,400
Revenue after
$1,600
Revenue change
−$800
the move cost you
Unit-free
✓
elasticity survives a change of units; slope does not
Show the numbers
| Price | Quantity | Revenue | |
|---|---|---|---|
| Before | $60 | 40 | $2,400 |
| After | $80 | 20 | $1,600 |
| Change | +33.3% | -50.0% | −$800 |
- If demand is elastic, you cannot afford to raise prices
- The volume you lose is worth more than the margin you gain. Cutting instead grows revenue, as long as the extra buyers more than cover the discount you just handed everyone who was already buying.
- If demand is inelastic, you surely can
- Few customers leave, and the ones who stay pay more. The only place neither move pays is exactly where elasticity equals 1 — which is also, not coincidentally, where revenue peaks.
- Income elasticity
- How demand reacts to customers getting richer. Jewellery is very sensitive. Insulin is not. A negative income elasticity — an inferior good — means people buy less of it as they earn more: ramen giving way to steak.
- Cross-price elasticity
- How your demand reacts to someone else's price. It is the measure that tells you which products are genuinely substitutes for yours, and therefore whose price moves you need to watch.
Movement vs shift
What shifts demand
Changing your own price moves you along the curve. Anything that changes willingness to pay itself moves the whole curve. Mixing these two up is the most common mistake in the whole module, and the distinction is worth internalising early.
What moves the curve, and what only moves you along it
Changing your price slides you along the line. Everything below changes willingness to pay itself, which picks the whole line up and moves it.
Net shift
+15
outward
Quantity at $60, before
40
Quantity at $60, after
55
Revenue at that price
$3,300
was $2,400
- Demand before
- Demand after
- We advertise. Advertising your own product raises WTP, pushing your demand curve right.
Show the numbers
| Price | Quantity before | Quantity after |
|---|---|---|
| $20 | 80 | 95 |
| $40 | 60 | 75 |
| $60 | 40 | 55 |
| $80 | 20 | 35 |
The other side
Costs and supply
Suppliers have their own invisible number: willingness to sell, the least they would accept for the input they provide. Value created is the gap between what your customer would pay and what your supplier would accept — everything else is a question of who keeps what.
Before you can analyse supply, you have to be honest about cost. Fixed costs do not move with volume; variable costs do. Fixed costs already committed are sunk, and sunk costs belong in no decision about what happens next. And economic cost includes opportunity cost — the value of the best thing you gave up — which accounting cost does not.
The supply curve is every firm's cost, sorted
Each block is one plant: its width is capacity, its height is what a unit costs it. At any price, everyone to the left of the line produces and everyone to the right sits idle.
Market price
$44.00
Industry output
65.0
of 110 capacity
Plants running
3 of 5
all-or-nothing at this price
Producer surplus
$1,170
- Cost per unit
- Producer surplus
- Demand
In the short run the plant already exists, so fixed cost is sunk and only variable cost decides whether it runs. A firm will sell at any price at or above its variable cost.
Show the numbers
| Firm | Capacity | Variable cost | Average total cost | Units produced | Surplus |
|---|---|---|---|---|---|
| Northvale | 20 | $18 | $32 | 20.0 | $520 |
| Tamesis | 25 | $26 | $38 | 25.0 | $450 |
| Orinoco | 20 | $34 | $48 | 20.0 | $200 |
| Kestrel | 25 | $45 | $57 | 0.0 | $0 |
| Halden | 20 | $58 | $68 | 0.0 | $0 |
- Fixed cost is not the same as sunk cost
- A fixed cost you have not committed yet is still a live choice. Once it is spent and unrecoverable it is sunk, and the right move is to let bygones be bygones.
- Opportunity cost is the cost you do not get invoiced for
- If you own the building, the cost of using it is what someone else would pay you to rent it — not the zero you charge yourself.
- Where relative cost analysis goes wrong
- Chasing every line item to the last decimal, spending equal effort on trivial and material costs, lumping fixed in with variable, and forgetting that two competitors may not have the same product mix.
- The entry test
- As an incumbent deciding whether to run, compare your variable cost to the least efficient producer's. As an entrant deciding whether to enter, compare your average total cost to theirs — you have fixed costs to cover too.
Why industries look the way they do
Economies of scale
Since fixed costs do not move with volume, the fixed cost carried by each unit falls as volume rises. That single fact explains why some industries hold dozens of firms and others hold three.
Why high fixed costs make big firms
Fixed cost does not change with volume, so every extra unit carries a thinner slice of it. That falling average is all “economies of scale” means.
Average total cost
$44.00
per unit, at our volume
Fixed cost per unit
$30.00
the part that shrinks
Cost at double the volume
$29.00
$15.00 cheaper per unit
We undercut the rival from
75k units
the entry test
- Our average total cost
- Our variable cost floor
- Rival's variable cost
The curve never reaches the variable-cost floor, it only approaches it. That is the trap in a volume business: the fixed cost is committed up front, and only enormous output makes it cheap per unit — which is why industries with high fixed costs end up holding few firms, and why even a small price drop can ruin the ones that are there.
Show the numbers
| Volume | Average fixed cost | Variable cost | Average total cost |
|---|---|---|---|
| 5k | $180.00 | $14.00 | $194.00 |
| 10k | $90.00 | $14.00 | $104.00 |
| 25k | $36.00 | $14.00 | $50.00 |
| 50k | $18.00 | $14.00 | $32.00 |
| 75k | $12.00 | $14.00 | $26.00 |
| 100k | $9.00 | $14.00 | $23.00 |
Where the two sides meet
Markets and equilibrium
Put demand and supply on the same axes and there is exactly one price where nothing is left over. Above it, sellers cannot find buyers. Below it, buyers cannot find sellers. Either way there is pressure on the price until it lands back at the crossing.
What a price control actually does
Equilibrium is the one price where nobody is left over — no buyer willing to pay who cannot get it, no seller willing to sell who cannot sell. Hold the price away from it and somebody is left over by construction.
This one bites.
Price
$34
Units traded
48
equilibrium is 80
Shortage (unserved)
64
someone is left over
Deadweight loss
$512
trades that never happen
- Demand
- Supply
- Consumer surplus
- Producer surplus
- Deadweight loss
Below equilibrium, more people want the product than sellers will produce. Price stops doing the allocating, so something else takes over: queues, waiting lists, rationing, or a grey market.
Show the numbers
| Measure | Value |
|---|---|
| Price | $34 |
| Quantity demanded | 112 |
| Quantity supplied | 48 |
| Units actually traded | 48 |
| Shortage | 64 |
| Consumer surplus | $2,112 |
| Producer surplus | $576 |
| Deadweight loss | $512 |
Who gets what
Dividing the value
Value created is willingness to pay minus willingness to sell, and it is fixed by what your product is and what your inputs cost. Price and cost do not change it. They only decide how it gets split between the customer, you, and your suppliers.
Who keeps the value a transaction creates
Value created is WTP minus willingness to sell, and nothing you do to price or cost changes it. Those two only move the lines that split it.
raise it and value is created
splits value with the customer
splits value with the supplier
lower it and value is created
Value created
$72
WTP − WTS
Consumer keeps
$28
39%
Firm keeps
$28
39%
Supplier keeps
$16
22%
- Consumer surplus
- Firm margin
- Supplier surplus
Drag price and cost and the bar restacks, but the stick never gets longer — that is value being divided. Drag WTP up or WTS down and the whole stick grows: that is the only kind of move that actually creates value.
Show the numbers
| Slice | Formula | Amount | Share of value created |
|---|---|---|---|
| Consumer surplus | WTP − price | $28 | 39% |
| Firm margin | price − cost | $28 | 39% |
| Supplier surplus | cost − WTS | $16 | 22% |
| Value created | WTP − WTS | $72 | 100% |
Learning what people would pay
Auctions and price setting
Cost-plus pricing — take your cost, add a markup — is common and mostly wrong, because it prices off what you spent rather than what the customer gets. Value-based pricing starts from WTP instead. Which leaves the practical problem: how do you find out what WTP is?
An auction makes competition do the work. Bid below your true value and you risk losing the item; bid above it and you risk overpaying. That squeeze is what makes bids informative.
Auction or fixed price?
An auction makes bidders reveal what they would pay, but it only ever collects the second-highest willingness to pay. A fixed price can reach higher — if you already know where to set it.
Close valuations favour the auction; a big gap at the top favours a fixed price.
Highest WTP
$92
what you wish you could charge
Auction revenue
$79
second-highest WTP, plus a bid increment
Best fixed price
$52
5 buyers
Fixed-price revenue
$260
the fixed price wins here
- Bidder's willingness to pay
- Auction clearing price
- Best fixed price
Why the auction stops at second place
The winner only has to outbid the runner-up. Revenue equivalence says the format barely matters — open outcry, sealed first-price, or Vickrey, the winner ends up paying roughly the second-highest bidder’s WTP. Drag the bidders apart and watch how much of the top bidder’s value the auction leaves on the table.
The winner’s curse
Revenue equivalence assumes private values. When bidders are guessing at a common value — mineral rights, a construction contract — the winner is usually whoever overestimated it most. You win and you lose money at the same time, which is why experienced bidders shade their bids down.
Show the numbers
| Bidder | Willingness to pay | Fixed price here | Buyers | Revenue |
|---|---|---|---|---|
| Ada | $92 | $92 | 1 | $92 |
| Bruno | $78 | $78 | 2 | $156 |
| Chen | $71 | $71 | 3 | $213 |
| Dalia | $63 | $63 | 4 | $252 |
| Emre | $52 | $52 | 5 | $260 |
| Fola | $40 | $40 | 6 | $240 |
- When an auction beats a fixed price
- When you genuinely do not know WTP, when you have to sell now, when there is no established market price, and when bidders' valuations feed off each other — that last case is the one where an open-outcry English auction earns its keep.
- When a fixed price beats an auction
- When you already know WTP well, when you can afford to start high and drift down, when buyers are the ones under time pressure, and when there is a big gap between the highest and second-highest bidder.
- Revealed preference
- Actions speak louder than words. What someone actually chose is evidence; what they told a survey they would choose is a survey answer. A well-designed experiment isolates one feature, randomises to kill off the variables you are not measuring, and is built so it can come out against you.
- Conjoint analysis
- Show people bundles of attributes at different levels and ask them to rank or choose. Their trade-offs reveal how much each attribute is worth — which is how you learn what to build as well as what to charge.
- Price discrimination and two-part tariffs
- Charging different customers different prices captures more surplus, and it can also shrink deadweight loss by serving buyers a single price would have shut out. Perfect price discrimination is rare; a two-part tariff — membership fee plus per-unit charge — is the everyday approximation of it, which is why warehouse clubs, theme parks and subscriptions all look the way they do.
Putting it together
Where to play, how to win
Strategy sounds like a large word for a large document, but the module reduces it to two questions. Everything else is detail hanging off them.
Where to play
- Which industry do you want to compete in?
- Which part of that industry?
- Which customers are you actually going after?
- How crowded is that space already?
How to win
- Which attributes will you differentiate on?
- How will you deliver them to that target customer?
- How easily can a competitor copy the answer?
Hotelling’s Stability in Competitionis the classic warning attached to this: when two competitors both chase the middle of a market, they end up indistinguishable from each other, and the ends of the market go unserved. Differentiation is not decoration — it is the thing that stops your demand curve from collapsing into someone else’s.
Recap
The module in ten lines
If you keep nothing else from this page, keep these. Each one is a sentence you can actually use in a meeting.
- WTP is the primitive
- Price is what you set. WTP is what you are trying to find out.
- A demand curve is sorted WTP
- Nothing more mysterious than that is going on in the line.
- Elasticity decides the direction of a price move
- Above 1, cut. Below 1, raise. At 1, revenue is already as high as it gets.
- Price moves you along; WTP moves the whole curve
- Advertising, substitutes, complements, income and network effects are all curve-movers.
- Value created is WTP minus WTS
- Price and cost only divide it. Only raising WTP or lowering WTS creates more of it.
- Sunk costs are irrelevant to the next decision
- Fixed is not the same as sunk, and opportunity cost is real even though nobody invoices you for it.
- A supply curve is the industry's cost analysis, sorted
- Short run, variable cost decides whether you run. Long run, total cost decides whether you stay.
- Economies of scale come from spreading fixed cost
- High fixed costs mean few firms, big minimum scale, and no tolerance for price drops.
- Equilibrium is the price with nobody left over
- Hold the price away from it and you have chosen a shortage or a surplus.
- Strategy is two questions
- Where to play, and how to win. Everything else is an implementation detail of those.