Questions about International Trade Policy.

You need to be proficient in international trade, because you need to analyze the variation of CS, PS, GR, W and other factors and write out the implicaiton according to the derivation process. You also need to be proficient in elementary calculus, because you need to use full derivatives and partial derivatives.
I will provide the lecture notes and a standard answer for specific import tariff, and some answer(not complete) for others(but not all questions have an answer). You need to follow the lecture notes and standard answer to calculate and make implications of every question. Following is the generally question type: Import tariff, Import tax, export tariff, export tax. However, tax/tariff distinguish by specific and ad valorem. so actually there are 8 types under perfect competition(4*2), and then, there are another condition, oligopoly. During oligopoly condition, you also need to do the 8 types question(same as above descriptions). Moreover, although there are 16 types question, but their core is similar. So maybe half of your answer can be copied.