The tool below drills those audits.
WeSolve+ reads the whole document and writes the questions for you
Upload your PDF, photograph your notebook, or point the camera. WeSolve+ writes questions from that material, explains why each answer is right, reads the chapter back to you as a podcast, and remembers every item you missed until you own it.
The tool below is a small browser-only tool and it is not WeSolve+: paste a few lines and text rules turn them into cards on the spot. The real app, the one that uses AI, is behind the link above.
Unit 6 market audits, from your own notes
This is a browser-only tool, and that is all it isIt splits the text you paste by rule, and nothing else. WeSolve+ is a different thing entirely: it reads your whole PDF with AI, writes the reasoning behind every question, speaks the chapter back to you, and remembers what you missed so it can return it. Try the real app now, free!
Rules do the cutting here, not judgement: paste a block and it returns cards. Nothing outside that block reaches the output.
Externalities split private curves from social ones
A negative externality lifts marginal social cost above private cost, so the market overproduces past the efficient quantity; a positive one lifts social benefit above private, and the market underbuilds. The graded diagram draws both curves, marks both quantities, and shades the deadweight triangle between them, pointing at the efficient quantity.
The fix mirrors the failure, and the wedge is the point
A Pigouvian tax equal to the marginal external cost moves the private curve onto the social one; a subsidy does the mirror job for positive spillovers. The instrument is graded by its size, equal to the externality at the efficient quantity, and by what it does to output: correcting, not punishing. Tradable permits reach the same quantity by capping it and letting price find the cap.
Public goods fail on two properties at once
A public good is nonrival, one person's use leaves no less, and nonexcludable, nonpayers cannot be kept out. Together they invite free riding, so private supply starves and government provision funded by taxes is the standard answer. The classification grid, rival or not, excludable or not, also files private goods, club goods and common resources, and the exam tests the grid directly.
Common resources are the grid's rival, open cell
Rival but nonexcludable describes fisheries, aquifers and open pasture: each user's take subtracts from others, yet no one can be turned away, so use runs past the sustainable quantity. In this course the fix is the property rights and quota column, assigning ownership or capping access, which is the micro rendering of a problem environmental science tells as a story. Classify first; the remedy follows the cell.
Inequality gets measured before it gets argued
The Lorenz curve plots cumulative income share against cumulative population share, bowing away from the equality diagonal, and the Gini coefficient summarises the bow between zero and one. Tax structures then sort by share of income paid as income rises: progressive rising, proportional flat, regressive falling. Both tools are descriptive on the exam, measurement before argument.
What to photograph for Market Failure and the Role of Government
Your failure graphs and the classification grid. Related: Unit 5, photo to quiz and pricing.
Sources used on this page
- College Board, AP Microeconomics
- Externality
- Public good (economics)
- Pigovian tax
- Lorenz curve
- Active recall
- Spaced repetition
- Testing effect
- Forgetting curve
- Generation effect
- Judgment of learning
- Metacognition
- Desirable difficulty
- Distributed practice
- Formative assessment
- Flashcard
- Cloze test
- Multiple choice
- Test (assessment)
- Educational assessment
- Advanced Placement
- Curriculum
- Study skills
- Study guide
- Note-taking
- Overlearning
- Instructional scaffolding
- Item analysis
- Mastery learning
| Failure | The signature | The matched fix |
|---|---|---|
| Negative externality | MSC above MPC, overproduction | Pigouvian tax or permits |
| Positive externality | MSB above MPB, underproduction | Subsidy at the spillover |
| Public good | Nonrival, nonexcludable | Tax funded provision |
| Common resource | Rival, nonexcludable | Quotas or property rights |
| Inequality question | Lorenz bow, Gini | Measured, then argued |
| Tax design question | Share by income | Progressive against regressive |
What does AP Microeconomics Unit 6 cover?
Market failure and government responses: externalities, public goods, common resources, corrective taxes and subsidies, plus inequality measurement.
How big should a corrective tax be?
Equal to the marginal external cost at the efficient quantity: enough to move the private curve onto the social one, no more.
What defines a public good?
Nonrival and nonexcludable together. Free riders cannot be kept out, so private markets undersupply and taxes fund provision.
How is a common resource different from a public good?
It is rival: each use subtracts. Open access then overuses it, and quotas or ownership rights pull use back to sustainable levels.
What do Lorenz and Gini actually show?
The Lorenz curve shows cumulative income against cumulative population; Gini compresses the bow into one number between zero and one.
Can I build questions from my own Unit 6 notes?
Yes. A photographed page or an uploaded PDF keeps the questions bounded: they come from what you gave, not from the rest of the course.
Last updated: 2026-08-15