Economics · Unit 12

Microeconomics

Elasticity, marginal thinking, and market structures

Microeconomics is the formal treatment of individual decisions, and its central tool is thinking at the margin - asking about the next unit rather than the total.

The unit covers marginal thinking, elasticity, consumer choice and utility, market structures, and factor markets.

This unit breaks down into 23 short steps and 120 questions, starting at difficulty 1 and building to 5. Below you can see exactly what it covers, how the path is structured, and worked examples with explanations.

Steps: 23
Questions: 120
Difficulty: 1-5

What this unit covers

Marginal Thinking
Elasticity
Consumer Choice and Utility
Market Structures
Factor Markets

Where this fits

Needs Supply and Demand and Businesses and Production.

Where people slip

Almost every economic decision is marginal. The question is rarely whether to do something at all but whether to do slightly more or less of it.

How the unit is structured

Microeconomics runs as 23 short steps that unlock in order. 17 are practice rounds and 6 are challenge rounds that pull together everything before them. Questions start at difficulty 1 and climb to 5 as you progress.

Step 1 · easierStep 23 · harder

Challenge rounds

Example questions

30 real questions from this unit, with the answer and the reason behind it, grouped by what they practise. There are 120 in the unit altogether.

Consumer Choice and Utility

Fill the blankLevel 1
1. The satisfaction or usefulness a person gets from consuming something is called ____.
- utilitycorrect
- profit
- revenue
- interest
Economists call the satisfaction from consuming a good its utility.
True or falseLevel 1
2. The more slices of cake you eat in a row, the less extra enjoyment each new slice tends to give.
Answer: True
This is diminishing marginal utility: each extra slice adds a little less satisfaction than the one before.
Choose all that applyLevel 2
3. Which of these help decide what a shopper buys? Choose all that apply.
- How much money they havecorrect
- The prices of goodscorrect
- How much satisfaction each good givescorrect
- The color of the store's roof
Money available, prices, and the satisfaction each good gives all shape a shopper's choices.
Multiple choiceLevel 2
4. The idea that each extra unit consumed adds a little less satisfaction than the one before is called what?
- Diminishing marginal utilitycorrect
- Rising total cost
- Perfect competition
- Opportunity cost
Diminishing marginal utility means the added satisfaction shrinks as you consume more of the same good.
Odd one outLevel 2
5. Which word does NOT belong with consumer choice and utility?
- Marginal costcorrect
- Satisfaction
- Preferences
- Budget
Marginal cost is about a producer's cost of making one more unit, not about a consumer's satisfaction.
Sort into groupsLevel 3
6. Sort each description as total utility or marginal utility.
Answer: The whole satisfaction from eating 5 apples = Total utility; The extra satisfaction from the 5th apple = Marginal utility; Satisfaction added by one more slice = Marginal utility; All the enjoyment from a full meal = Total utility
Total utility is all the satisfaction combined, while marginal utility is only the extra from one more unit.

Elasticity

Choose all that applyLevel 2
7. Which of these tend to make demand MORE elastic? Choose all that apply.
- Many substitutes are availablecorrect
- The good takes a big share of your incomecorrect
- Buyers have lots of time to adjustcorrect
- The good is a basic necessity
Substitutes, a big share of income, and time to adjust all make buyers more sensitive to price.
Fill the blankLevel 2
8. When a small price change makes people buy a lot more or a lot less, we say demand is ____.
- elasticcorrect
- inelastic
- fixed
- average
Elastic demand stretches a lot: a little price change causes a big change in how much is bought.
Multiple choiceLevel 2
9. Which of these usually has inelastic demand, meaning buyers keep buying even when the price rises?
- A life-saving medicinecorrect
- One brand of soda among many
- A movie ticket
- A luxury vacation
A life-saving medicine has few substitutes and is a necessity, so people keep buying it even at higher prices.
Odd one outLevel 2
10. Which item does NOT usually have very inelastic demand?
- Fresh strawberries in summercorrect
- Insulin for a diabetic
- Tap water
- Basic table salt
Fresh strawberries have close substitutes and are not a necessity, so their demand is much more elastic than the others.
Guess the numberLevel 3
11. Quantity demanded falls 20% when price rises 10%. What is the price elasticity of demand as a positive number?
Answer: 2
Dividing the 20% drop in quantity by the 10% rise in price gives an elasticity of 2 (in absolute value).
Sort into groupsLevel 3
12. Sort each price elasticity of demand value as elastic or inelastic.
Answer: Elasticity of 2.5 = Elastic; Elasticity of 0.3 = Inelastic; Elasticity of 1.8 = Elastic; Elasticity of 0.6 = Inelastic
Demand is elastic when the elasticity is greater than 1 and inelastic when it is less than 1.

Factor Markets

Guess the numberLevel 1
13. Land, labor, and capital: how many main factors of production is that?
Answer: 3 factors
Land, labor, and capital make three main factors of production (some lists add entrepreneurship as a fourth).
Multiple choiceLevel 1
14. Factor markets are where firms buy resources to produce goods. The three main factors are land, labor, and what?
- Capitalcorrect
- Candy
- Sunshine
- Homework
The classic factors of production are land, labor, and capital (tools and machines).
Fill the blankLevel 2
15. Tools, machines, and factories used to make goods are the factor of production called ____.
- capitalcorrect
- land
- labor
- rent
Capital is the human-made equipment, like tools and machines, used to produce other goods.
Match the pairsLevel 2
16. Match each factor of production to the payment it earns.
Answer: Land = Rent; Labor = Wages; Capital = Interest; Entrepreneurship = Profit
Land earns rent, labor earns wages, capital earns interest, and entrepreneurship earns profit.
Odd one outLevel 2
17. Which of these is NOT a factor of production?
- Pricecorrect
- Land
- Labor
- Capital
Price is what things sell for, not a resource used to make them; land, labor, and capital are the factors.
Choose all that applyLevel 3
18. Which of these usually raise the wage paid in a labor market? Choose all that apply.
- Workers being scarce and hard to replacecorrect
- High productivity of workerscorrect
- Strong demand for the product they makecorrect
- The product going out of fashion
Scarce workers, higher productivity, and strong demand for the product all push wages up; falling product demand lowers them.

Marginal Thinking

Fill the blankLevel 1
19. In economics, the word 'marginal' means one ____ unit.
- morecorrect
- whole
- average
- fewer
Marginal always points to the next single unit, the one more you might add.
Multiple choiceLevel 1
20. Marginal cost is the cost of producing what?
- One more unit of outputcorrect
- All the units added together
- The very first unit only
- The cheapest unit
Marginal cost is the extra cost of making just one more unit of a good.
True or falseLevel 1
21. Marginal benefit is the extra benefit you get from doing one more of something.
Answer: True
Marginal benefit measures the added value of the next single unit or action.
Put in orderLevel 2
22. Put these steps of a marginal decision in the correct order.
Answer: Ask what one more unit would add -> Estimate its extra benefit -> Estimate its extra cost -> Do it only if the benefit is at least the cost
Marginal thinking asks about one more unit, weighs its benefit and cost, then acts only if it is worth it.
Choose all that applyLevel 3
23. Which statements about marginal thinking are correct? Choose all that apply.
- The optimal quantity is where marginal benefit equals marginal costcorrect
- Sunk costs should not affect the next choicecorrect
- Each decision compares the benefit and cost of one more unitcorrect
- You should always produce as much as physically possible
The best quantity is where marginal benefit equals marginal cost, sunk costs are ignored, and each choice weighs one more unit.
Odd one outLevel 4
24. Which of these does NOT belong with a firm's profit-maximizing output rule?
- Average fixed costcorrect
- Marginal revenue
- Marginal cost
- The output where they are equal
The profit-maximizing quantity depends on marginal revenue and marginal cost, not on average fixed cost.

Market Structures

Multiple choiceLevel 1
25. Economists usually describe how many main types of market structure?
- Fourcorrect
- Two
- Three
- Twelve
The four main market structures are perfect competition, monopolistic competition, oligopoly, and monopoly.
Fill the blankLevel 2
26. A market with many firms selling slightly different versions of a product, like different coffee shops, is called ____ competition.
- monopolisticcorrect
- perfect
- pure
- single
Monopolistic competition has many firms, but each makes its product a little different from the rest.
Match the pairsLevel 2
27. Match each market structure to a feature that describes it.
Answer: Perfect competition = Many identical sellers; Monopoly = A single seller; Oligopoly = A few big firms; Monopolistic competition = Many differentiated sellers
Each structure differs mainly in how many sellers there are and how alike their products are.
Sort into groupsLevel 2
28. Sort each market structure by how many sellers it usually has.
Answer: Monopoly = One seller; Oligopoly = A few sellers; Perfect competition = Many sellers; Monopolistic competition = Many sellers
Monopoly has one seller, oligopoly a few, and both competitive markets have many.
Choose all that applyLevel 3
29. Which of these are features of perfect competition? Choose all that apply.
- Many buyers and sellerscorrect
- Identical, standardized products
- Firms are price takerscorrect
- High barriers to entry
Perfect competition has many buyers and sellers, identical products, and price-taking firms, but no high barriers to entry.
Put in orderLevel 4
30. Order these market structures from MOST competitive to LEAST competitive.
Answer: Perfect competition -> Monopolistic competition -> Oligopoly -> Monopoly
Competition falls as you move from many identical sellers to a single seller with full market power.

Where these questions come from. Each unit starts as a plan of the concepts it should cover and the difficulty it should span. Questions are written against that plan with AI assistance, then checked by a validator that rejects anything without a single defensible answer, an explanation, or plausible wrong options. How we write questions sets out the whole process, and corrections are fixed in the bank and reach the site and the app the same day.

How you practise

This unit mixes 10 different question formats, so you are recalling and applying rather than recognising the same layout every time.

Choose all that apply
Fill the blank
Guess the number
Match the pairs
Multiple choice
Odd one out
Put in order
Sort into groups
True or false
Type the answer

Practise Microeconomics

120 questions across 23 steps. Start with step one and crawl at your own pace.

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