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For each of the following pairs of goods

For each of the following pairs of goods, which good would you expect to have more elastic demand and why?
a. required textbooks or mystery novels
b. Beethoven recordings or classical music recordings in general
c. heating oil during the next six months or heating oil during the next five years
d. root beer or water

In the 1970s OPEC caused a dramatic increase in the price of oil

In the 1970s, OPEC caused a dramatic increase in the price of oil. What prevented it from maintaining this high price through the 1980s?

Is the price elasticity of supply usually larger in the short run or in the long run

Is the price elasticity of supply usually larger in the short run or in the long run? Why?