A man is selling ribbon: when he sets the price at p (per meter) the demand for ribbon is x*(p) = 18 − 1/6p^2 meters of ribbon. Find the revenue-maximizing price (where revenue is price times the quantity demanded at that price: i.e., R(p) = px*(p)). Show that at the revenue-maximizing price the elasticity of demand is (negative) 1.

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