I went to college dead set on majoring in business since I learned I love business while starting my first company in high school. When I finally took a couple business classes, I was very disappointed that they purported to be practical but really were just teaching theories that were neither practical nor intellectually challenging.
For example, in marketing class we memorized countless frameworks and went over cases of what consumer packaged goods companies did decades ago. Anyone who has ever ran a business knows marketing requires creative thinking, and frameworks are rarely helpful except to sound smart to a boss. Would Steve Jobs have learned to market electronics the brilliant way he did if he studied how Procter & Gamble grew Bounty's market share by 3%?
Meanwhile, I found philosophy to be challenging, enjoyable and filled with interesting people. Studying philosophy prepares one just as well for the world of business and startups as studying business or economics -- which is to say not at all. But everyone in the philosophy department is honest about it: no one pretends the lessons of philosophy will be directly applicable to business. But it will make you more interesting at cocktail parties, which counts for a lot in business.
Oh, and living an examined life is pretty cool too.