Why do long-run elasticities of demand differ from short-run elasticities? Consider two goods: paper towels and televisions.

Question:

Why do long-run elasticities of demand differ from short-run elasticities? Consider two goods: paper towels and televisions. Which is a durable good? Would you expect the price elasticity of demand for paper towels to be larger in the short run or in the long run? Why? What about the price elasticity of demand for televisions?