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How Markets Work: fun facts and quiz
The essentials in 7 ideas, with fun facts, an illustrated story and a quiz to see how much you know.
The essentials
Supply & Demand
Prices come from supply and demand. When lots of people want something scarce, the price rises; when there’s plenty and few buyers, it falls.
Key fact
Concert tickets resell for more when demand beats supply.
Opportunity Cost
Every choice has an opportunity cost: the value of the best thing you gave up. An hour of gaming costs the hour you could have spent on anything else.
Key fact
Time is a cost too, not just money.
Scarcity
Economics starts with scarcity: our wants are endless, but time, money and resources are limited. So people, firms and governments must choose.
Key fact
Scarcity is why things have prices at all.
Competition
When many firms sell the same thing, they compete on price and quality, which helps buyers. When one firm dominates, it’s called a monopoly.
Key fact
Monopoly comes from the Greek for “single seller”.
Prices as Signals
Prices carry information. When oil gets expensive, people drive less, firms look for other fuels and producers pump more, without anyone giving orders.
Key fact
Adam Smith called this the “invisible hand”, in 1776.
Elasticity
Some things we buy whatever the price, like medicine or salt. Others we drop quickly when prices rise, like takeaway coffee. Economists call this elasticity.
Key fact
Goods with few substitutes tend to have inelastic demand.
Bubbles
Sometimes prices soar far above what things are worth, because people expect to sell to someone else for more. When the mood turns, the bubble pops.
Key fact
In 1637, some Dutch tulip bulbs sold for more than a craftsman’s yearly pay.
Fun facts
Ride-hailing apps raise fares when demand spikes, partly to pull more drivers onto the road.
“There’s no such thing as a free lunch” comes from bars that offered free food to customers who bought drinks.
Water is vital yet cheap, while diamonds are pricey. Adam Smith puzzled over this “paradox of value” in 1776.
The board game Monopoly grew out of The Landlord’s Game, invented in 1904 by Lizzie Magie to show the dangers of monopolies.
In the 1958 essay “I, Pencil”, a pencil explains that no single person knows how to make it from scratch.
In theory, some staples are bought more when their price rises, if poor families can then afford nothing better. They’re called Giffen goods.
At the height of the dot-com bubble, some firms with no profits were worth billions.
Story: The Tulip That Cost a Fortune
The Tulip That Cost a Fortune
1630s Holland. Tulips with flame-like stripes are the height of fashion. The rarest, Semper Augustus, is almost never for sale at any price.
Traders buy and sell bulbs still in the ground, hoping to sell on for more. Prices climb and climb through the winter of 1636–37.
In February 1637, buyers stop turning up at an auction in Haarlem. Within days, prices collapse. The prized stripes, it turned out, came from a virus.
True or false?
Tap your answer to see if you got it, and why.
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Question 1 of 10
If demand rises and supply stays the same, prices tend to rise.
Show the answer
True. More buyers chasing the same amount pushes the price up.
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Question 2 of 10
Choosing one option means giving up the best alternative.
Show the answer
True. That lost alternative is the opportunity cost.
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Question 3 of 10
Scarcity means resources are limited compared with what people want.
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True. It’s the basic problem economics studies.
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Question 4 of 10
Competition between sellers tends to push prices down.
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True. Firms cut prices or improve quality to win customers.
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Question 5 of 10
Higher prices can encourage producers to make more.
Show the answer
True. Selling becomes more profitable, so supply grows.
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Question 6 of 10
Demand for essential medicine barely changes when its price rises.
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True. People need it, so they keep buying it.
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Question 7 of 10
In a bubble, prices rise far above what things are really worth.
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True. Buyers bet that prices will keep climbing.
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Question 8 of 10
A shortage means there’s more of something than people want.
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False. That’s a surplus. A shortage is when people want more than is available.
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Question 9 of 10
Opportunity cost only counts money you actually pay.
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False. It includes time and the chances you give up.
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Question 10 of 10
Scarcity only affects poor countries.
Show the answer
False. Everyone faces limits, even the richest people and countries.
Keep going in the app
KnowSoda learns what you know and brings back what you’re about to forget. How Markets Work has 6 more ideas at the Advanced and Expert levels.
Sources
- Khan Academy — Microeconomics
- CORE Econ — The Economy
- Adam Smith (1776), An Inquiry into the Nature and Causes of the Wealth of Nations
- Encyclopaedia Britannica — monopoly, tulip mania, dot-com bubble
- The Strong National Museum of Play — The Landlord’s Game and Monopoly
- Encyclopaedia Britannica — externality, public good, game theory, auction
- The Nobel Prize — Economic Sciences 1994
