Casadesus and Ricart (How to Design A Winning Business Model by Ramon Casadesus-Masanell and Joian E Ricart, Harvard Business Review, Reprint January-February 11) state that a business model is different than strategy, yet the concept of a business model creating virtuous cycles, and Porter's notion of strategic alignment or "internal fit" share some similarities. Per Casadesus and Ricart, how does a business model and a strategy differ? Do you agree with these authors? (Explain your answer.)