For each of the pair below, indicate when you, as a seller, would use price discrimination method. For your answer for each pair, please provide very brief explanation of your choice : 1) A good that has close substitutes vs a good that has close complements. 2) An acyclic good vs a noncyclic good. 3) A good that you are planning to sell only in the short run vs a good that you are planning to sell in the long run. 4) A good whose demand can be accurately forecasted vs a good whose demand forecast is uncertain. 5) A good which has a high positive advertisement elasticity vs a good that has a low positive advertisement elasticity.