Comparative Advantage, explained.
Comparative advantage concerns lower opportunity cost, unlike absolute advantage, which concerns lower direct resource use.
Why it happens
Both countries have twelve labour hours. A needs 1 hour per bread and 2 per cloth; B needs 3 and 4. Reallocate production from bundles (6,3),(2,1.5) to (9,1.5),(0,3). B offers 1.5 cloth for a chosen bread payment; payments from 2 to 3 leave both with at least their original bundles.
Comparative advantage concerns lower opportunity cost, unlike absolute advantage, which concerns lower direct resource use.
Read the result
Verify labour use and consumption separately. The exercise uses partial specialisation to preserve both countries' cloth consumption while creating an extra bread.
A worked example
A faster producer can still benefit from exchange
Check that both initial and reallocated production plans use twelve hours in each country under the stated unit labour costs.
Trade one and a half cloth from B for two and a half bread from A under the reallocated plan.
A consumes six and a half bread and three cloth; B consumes two and a half bread and one and a half cloth. Both gain half a bread.
OPTIONAL DEEPER DETAILGo deeper: inside the model
Inside this model
Both countries have twelve labour hours. A needs 1 hour per bread and 2 per cloth; B needs 3 and 4. Reallocate production from bundles (6,3),(2,1.5) to (9,1.5),(0,3). B offers 1.5 cloth for a chosen bread payment; payments from 2 to 3 leave both with at least their original bundles.
Where this idea is useful
A practical use
A faster team member can still benefit from a division of work based on relative tradeoffs.
A common misconception
“If one producer is faster at everything, exchange cannot help.”
Opportunity costs can differ even when absolute productivity favours one producer in both goods. Gains depend on feasible reallocation and acceptable exchange terms.
What this explanation leaves out
- Output is divisible, resources fully used, trade costless and preferences assessed only by no-less-of-either-good comparisons. Distribution within countries, adjustment costs and changing technology are excluded.
Why does the model avoid complete specialisation by both countries?
The chosen partial plan supports a transparent no-less-of-either-good comparison with the initial bundles. Full specialisation need not preserve that particular output mix.
Which opportunity cost differs between collaborators even when one performs every task faster?
Associated thinkers
Associations marked provisional are awaiting source review.
Further reading
Explore the original research or the teaching reference behind this experiment.