As a rule, organizations are created to avoid the transaction costs on those detail tasks. If you externalize every single supporting task into a market, you wi

As a rule, organizations are created to avoid the transaction costs on those detail tasks. If you externalize every single supporting task into a market, you will be slowed down to a drag, won't be able to use most competitive advantages, and will pay way more than doing them in house. But removing the market competition is a breeding ground for inefficiency. So there's a balance there, and huge conglomerates tying their divisions together serves only to make the competitive ones die by the need to use the services of the inefficient ones.