A quantity limit leaves price to adjust.
A quota sets a maximum permitted quantity over a defined period. A binding quota below the unrestricted equilibrium quantity restricts supply and raises the market-clearing price on the demand curve. A quota does not itself say who receives licences or who gets the resulting scarcity rent, an extra return created by the restriction; free allocation and an auction distribute receipts differently.
- Binding
- A quota is a maximum quantity, not a target that must be filled. It binds below the quantity that would trade without it; a cap above the original quantity leaves that outcome possible.
- Price
- With fewer units allowed, buyers compete for the limited quantity. The demand curve shows the price at which they will buy exactly that amount.
- Licences
- Licences are permissions to supply or trade. Free licences bring government no licence payment; auctioning them, by selling to bidders, can generate receipts.
Licence design changes the payment story
Draw the restriction
Retain the original supply relationship for quantities below the quota, then draw a vertical limit at the permitted quantity. A restrictive cap is not a parallel shift of the whole original supply curve.
Free allocation
When licences are free and retained by sellers, government receives no licence payment just because output is restricted.
Auction or resale
An auction can produce government receipts. Resale can transfer payments to licence holders. Identify who pays whom before measuring producer receipts.
Quantity and use
A maximum quota does not guarantee every licence is used. Demand must support the quantity and licence holders must be able and willing to supply.
Worked example: A 40-unit daily limit
Demand is P=10-0.05 Q and supply is P=2+0.05 Q. Without intervention, 80 units trade daily at $6. Government permits at most 40 units per day and gives licences to sellers without charge.
- The restricted supply follows the original curve up to 40 units, then cannot extend beyond that quantity.
- At Q=40, demand gives a buyer price of $8. On the original supply curve, the last permitted unit, called the marginal unit, would have required a price of $4.
- If all 40 licences are used, buyers spend $320. Sellers receive that $320 when licences are free and retained by them.
- Government does not automatically receive the $4-per-unit gap. If it auctions licences, the licence payments must be accounted for separately.
Watch out for this
A quota is the same as a government price ceiling.
A quota restricts quantity; price can rise. A ceiling restricts price and may leave excess demand.
Check your understanding
A market would sell 80 units without intervention. A maximum quota of 100 is introduced. With no other change, how many units trade?
- 80
- 100
- 20