I agree that entrepreneurship is a great opportunity to make and learn from mistakes in execution. It's also an opportunity to try completely new things that ma

I agree that entrepreneurship is a great opportunity to make and learn from mistakes in execution. It's also an opportunity to try completely new things that may or may not work. Other sorts of mistakes, though--like being ignorant of existing players, failing to explain why someone would use your product, or having no remote plan to profitability--are more troublesome. They indicate a lack of business acumen or even common sense that will make success incredibly unlikely. As with execution mistakes, you can learn these things through experience, too. However, I would not want to invest my time and money teaching them to someone unwilling or unable to learn those lessons on their own. Which gets back to my original point... Who wants to hear, "You seem to lack common sense"?