A brand name can be a source of market power

If the opportunity cost of manufacturing machinery is lower in the United States than in Britain and the opportunity cost of manufacturing sweaters is higher in the United States than in Britain, then the United States will:

A) export both sweaters and machinery to Britain. B) import both sweaters and machinery from Britain. C) export sweaters to Britain and import machinery from Britain. D) import sweaters from Britain and export machinery to Britain.

Suppose two goods are perfect substitutes. The price elasticity of demand of one of the goods is

A) 0. B) 1. C) 1000. D) infinity.