mbam619 student walmart strategy value_chain analysis industry business students xerox 3do progressive industry_analysis pest best value value_creation sarah lance chain natalie_rebot bestofbest sandro_olivieri ben_fieman busienss thinking visual 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 visualization
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