No, the whole point of going to a business school is to manage a medium/big business or grow a medium business into a big business. We have not yet figured out what exactly makes a new business venture succeed (apart from having heuristics in the most general terms). We have had better luck with the question of "How do I manage an existing business?" or "How do I grow the volume of business?" which is what the business schools teach (apart from a couple of entrepreneurship courses).