3. Using the DD-AA model, analyze the output and balance of payments effects of an import tariff under floating exchange rates. (10%) 4. Please answer the following questions: (1) How do you use Moving Average Convergence Divergence (MACD) to create a forex trading strategy? Explain. (5%) (2) How do you use Stochastic Oscillator to create a forex trading strategy? Explain. (5%) (3) How do you use Relative Strength Index (RSI) to create a forex trading strategy? Explain. (5%) (4) How do you use Williams %R create a forex trading strategy? Explain. (5%)