Economics explanations
One clear answer per page, each with a worked example and FAQ. Written for AP Micro, AP Macro, IB, and Econ 101 students who want the concept to actually click.
Microeconomics
Why does the demand curve slope downward?
The substitution effect, the income effect, and diminishing marginal utility all push the same way: people buy less as price rises. With a worked example.
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Why do price ceilings cause shortages?
A binding ceiling sits below the equilibrium price, so quantity demanded exceeds quantity supplied. Step-by-step explanation with a worked example.
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Why do price floors cause surpluses?
A binding floor sits above the equilibrium price, so quantity supplied exceeds quantity demanded. The minimum wage is the classic example.
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Why does a monopoly produce where MR = MC?
While marginal revenue beats marginal cost, each extra unit adds profit. The crossover MR = MC sets the quantity; the price is read up on the demand curve.
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Why do monopolies create deadweight loss?
Monopolists set MR = MC and restrict output below the competitive level. The triangle between demand and MC, from Qm to Qc, is the deadweight loss.
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Why does a per-unit tax create deadweight loss?
A tax drives a wedge between buyer and seller prices, shrinking the quantity traded. The surplus on the trades that no longer happen simply vanishes.
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Macroeconomics
Why does government spending have a multiplier?
One dollar of spending becomes someone's income, part of which they spend, becoming the next person's income. The chain lifts GDP by more than the first dollar.
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Why is the tax multiplier smaller than the spending multiplier?
Government spending enters the economy in full; a tax cut is partly saved before it ever circulates. That gap is why the tax multiplier is smaller.
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How do banks create money?
Banks lend out most of every deposit, and those loans become new deposits elsewhere. Repeated, the process multiplies the money supply beyond the original cash.
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Why is the short-run Phillips curve downward sloping?
Low unemployment and high inflation tend to arrive together: tight labour markets bid up wages and prices while inflation expectations stay fixed.
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Why is the long-run Phillips curve vertical?
In the long run, expectations catch up with inflation, so there is no lasting trade-off between inflation and unemployment. The curve stands at the natural rate.
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Real vs. nominal GDP: what's the difference?
Nominal GDP values output at this year's prices; real GDP holds prices fixed so only the amount produced moves. The gap between them is pure inflation.
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Why does inflation help borrowers and hurt savers?
Unexpected inflation shrinks the real value of fixed debts. Borrowers repay in cheaper dollars; lenders and savers get back money that buys less.
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