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Price elasticity of demand coefficient of infinity

A price elasticity of demand coefficient of infinity implies that: (w) the demand curve is horizontal. (x) each 1 percent price hike elicits a 1 percent increase in revenue. (y) total revenue increases proportionally as a firm increases its price. (z) even infinite raises in income have no consequence on demand.

Please guys help to solve this problem of Economics with some explanation.

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