3. Assume that the world consists of only two countries: Australia and Indonesia. Australia's demand curve for A4 copy paper and Australia's supply of A4 copy paper are

D= 100-20P

S= -20+20P

Indonesia's demand curve for A4 copy paper and Indonesia's supply of A4 copy paper are:

D*=80-20P

$*=40+20P

where D, S, and P denote demand, supply, and the price in Australian dollars, respectively.

Please answer the following questions: If Australia and Indonesia can freely trade with each other, please graphically show the trade patterns between them? Specifically, which country will be the exporter of A4 copy paper? What is the price of A4 copy paper in free trade? What is the volume of their bilateral trade? (20 points)

4. Given the information in Question 3 assume now that Australia's government decides to impose a specific tariff of AU$ 1 on Australia's A4 copy paper imports from Indonesia.

The government may ask domestic consumers who buy the imported A4 copy paper to pay the tariff. Alternatively, the Australian government may ask the Indonesian producers to pay the tariff if they sell A4 copy paper to Australian consumers. Please graphically show that the effects of the tariff on the patterns of trade are the same no matter whether Australian A4 copy paper consumers or Indonesia's A4 copy paper producers have to pay the tariff.

Hint: Please determine and graph the effects of the tariff on the following: the price of A4 copy paper in each country, the quantity of A4 copy paper supplied and demanded in each country, and the volume of trade. Note that the tariff will influence Australia's import demand if Australian consumers of A4 copy paper have to pay the tariff. Alternatively, the tariff will influence Indonesia's export supply if Indonesian A4 copy paper producers have to pay the tariff.

just the question 4 answer please