Consider the emerging business practices of guaranteed delivery by e-commerce companies. Recently, more web-based companies or companies' e-commerce channels begin to provide premium, guaranteed delivery services for customers. Examples include Amazon's Prime program and retailers' over-night delivery during holidays. Do these delivery strategies have different supply chain structures as compared to regular delivery services? Explain why and why not. Also, discuss how e-commerce companies need to do in terms of supply chain coordination and infrastructure investments to make these strategies work. Finally, discuss will these practices result in profitability.