Why does Canada export lumber, while the United States exports wheat and China exports labor-intensive manufactured goods?
A.
Each is producing what it most efficiently produces and all benefit from their doing so.
B.
Each has imposed tariffs on what others produce so that it can subsidize its industries.
C.
Each is required by the World Trade Organization (WTO) to concentrate on producing what others need, not just what they need.
D.
Their command economies depend on specialization.
