Differences between Contribution and Traditional Income Statements; Company Segments

1. What is the difference between a contribution income statement and a traditional income statement?  Under what circumstances would a firm use each?
2. What is a company segment?  Why would a firm want to divide itself into operating segments?  Why would a firm want to measure profits by segment?  How would common costs be allocated to each of a company’s segments?

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150-300 words per question