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Which of the curves have constant price elasticities

Which of the given curves have constant price elasticities: (1) A vertical demand curve [when one ever exists]. (2) A horizontal curve which is a demand curve which is identical with a horizontal supply curve. (3) A demand curve which is a rectangular hyperbola. (4) A vertical supply curve. (5) All of the above.

I need a good answer on the topic of Economics problems. Please give me your suggestion for the same by using above options.

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