5 year comparison between nasdaq and computer index 1 pc market segments by products regions us worldwide pcs in use sales per 000 people world wide vendor share growth business models big box stores vs jit delivery continuous innovation cost leadership differentiation own brand retail consulting stripped service white boxes low leader product competition life cycle customers demand convenience value for their money the need speed has been diminished ebay second handed machine replacement changed from every 2 3 years to machines are upgradeable key success factors r&d tablet branding competitive pricing constantly reexamine way do after extensive lines future consideration threats commodity like differ very little constant downward price pressure death of longer trends branching out into