Suppose there are three countries in the world: Australia, New Zealand, and Vietnam. Australia's domestic demand for headphone follows = 150 while its domestic supply of headphone follows = 1.5 35 where , refer to Quantities Demanded and Supplied in Australia at the domestic price , respectively. The unit cost of headphone production in Vietnam is $40, while it is $50 in New Zealand. Currently, there is an 80% tariff on headphone imports into Australia