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A stockholder holds one share each of two different companies A and B. Last month, the value of a share of Company A increased by 13 dollars and that of Company B decreased by 8 dollars. How much did the net value of the two shares increase last month?
Net value increase = Total increase of the shares combined. Since A increased $13 and B decreased $8, simply calculate 13 - 8 = $5, which matches choice D.