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)A cyclic 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.