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The candy market is characterized by the following supply and demand functions (with P designing price and Q quantity). Both demand and supply functions are linear. The demand is expressed as: P = 18 - Qd and the supply as: P =4 + 2*Qs. Candies are bad for children's teeth and the government has decided to impose of unit tax of 2 € in order to limit consumption. Compute the tax revenue earned by the government.

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