Difficulty: Very hard. Most buy side analysts wouldn't get this.

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* 1. What is the key flaw in GrubHub's business model?

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* 2. How could you fix this?

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* 3. What would be the result of that fix?

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* 4. What is your Twitter handle?

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* 5. If you'd like to be considered for an upcoming Duck Call (our periodic recruiting events), please provide your email.

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