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mbam619 student walmart strategy value_chain industry analysis students business 3do xerox progressive industry_analysis pest value_creation best value lance sarah chain scm mei culture organization resourcebasedview framwork dsir networkeffects bestofp&g midterm bestofmid barriertoentry advantages incumbency strategyrecap businessmodel positioning maps perceptual activity creating progresive value chain porters5forces lesson5 bestofbest natalie_rebot sandro_olivieri ben_fieman busienss thinking visual visualization