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Horizontal summation of individual demand curves

The market demand curves for most of the goods are as: (i) Cross-multiplied products of the individual demand curves. (ii) Insignificant for most of the analytical aims. (iii) The horizontal summation of the individual demand curves. (iv) Irrelevant for business decision-making. (v) The vertical summation of individual demand curves.

Can someone please help me in finding out the accurate answer from the above options.

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