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Restrictions on free trade
Advantages and disadvantages of free trade
Advantages of free trade
Disadvantages of free trade
• Specialisation leading to
increased output
• Trade allows economies of scale
(larger market to sell to)
• Lower price and increased
choice
• Competition and innovation
• Risk – interdependence, overreliance on trade, loss of control
• Unemployment (perhaps)
• Income inequality
• Environmental impact
• Culture
Welfare Gain From Trade
S domestic
P domestic
P world
A
B
C
S world
D domestic
QS
QD
domestic
domestic
Imports
Consumer surplus gain = A + B + C
Producer surplus loss = A
Total welfare gain = B + C
Trade Protection Options
• Tariffs: taxes on imports
• Quotas: quantity restrictions on imports
• Subsidies: given to domestic firms to help them compete in foreign
markets
• Regulations: can make it very difficult or expensive for foreign
products to comply
Tarrifs
• A tax on imported goods (aka import duty/ customs duty) designed to raise the price to the
level of, or above the existing domestic price.
Tariffs – A Loss of Welfare
S domestic
P tariff
P world
A
B
C
S world
D
D domestic
Q S1
Q S2
Q D2
Q D1
free trade
with tariff
with tariff
free trade
Lower Imports
Consumer surplus reduced by A + B + C + D
Producer surplus increased by A (domestic producers expand production at ↑ price)
Gov’t tax revenue = C
Total loss of welfare = B + D
Quotas
• A physical limit on the quantity of the good imported.
• Increases the share of the market available for domestic producers.
Welfare loss from quota
Quota amount decided,
added to domestic production
SD1
Loss in consumer
surplus is A+B+C+D
Gain in producer surplus is A
PW +q
PW
Who receives C?
A
B
C
D
SW
D
QS1
QS2
QD2
QD1
Generally importers, so
welfare loss is B+C+D
If the government sold licences
to import, welfare loss is
between B+D and B+C+D
So tariffs are better
than quotas
Subsidies
• Can be used to increase exports and reduce imports.
• Export subsidies to increase exports and support industries
• Subsidies to reduce imports – subsidising firms that compete with
imports.
Welfare loss from subsidy
SD1
New producer surplus
is A+B+C+D
SD2
SW
PW
A
S
PW S
Original producer
surplus is A
C
Gain in producer
surplus is B+C+D
Subsidy costs taxpayers
A+B+C+E
B
E
D
So loss from subsidy is
A+B+C+E minus B+C+D
Which is A+E-D
D
QS1
QS
2
QD1
Since A is the same
as D the loss is E
Why have trade restrictions?
• If countries specialise according to comparative advantage there are
major gains from trading
• Tariffs, quotas and other restrictions lead to welfare loss, so why do
some countries have protectionist policies?