character: Professor Brown
topic: Cross Elasticity of Demand
grade: 11
subject: Economics
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character: Professor Green
topic: Price Elasticity of Demand
grade: 11
subject: Economics
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character: Professor White
topic: Substitutes and Complements in Economics
grade: 11
subject: Economics
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character: Professor Black
topic: Demand Curve Shifts
grade: 11
subject: Economics
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