5. (Optional Question) Note: the optimal question will be graded ONLY IF you finish all the previous questions and get a full score. Answering this optional question will give you 0.5 additional points towards your final grade of the course. Below figure illustrates the market of rare metals in a country when it begins to trade with other countries in the international market. As you can see, because the country's domestic equilibrium price is lower than the international price, it will export rare metals to other countries at the (higher) international price, resulting in a gain from trade. However, producing rare metals produces pollution that harms local workers. Discuss: when there is a negative externality in producing rare metals, will the country still benefit from opening to trade? Price Quantity Demanded by Domestic Buyers World Price Domestic Price Loss of Consumer Surplus; Gain of Producer Surplus Quantity Produced Without Trade by Domestic Suppliers Producer Surplus Gain from Exporting Quantity