Greylock general partner Reid Hoffman and his Blitzscaling co-author Chris Yeh pick up their conversation from last week on how philosophical study can have a great impact on an entrepreneur's career. This week, they focus on how a philosophy degree compares to a much more conventional business background: the MBA."There are two things that need to be explained away in order for me to invest in your startup," says Hoffman, who holds an advanced degree in philosophy. "An MBA or a background in management consulting." While there are many exceptions, Hoffman believes pursuing an MBA can generally be adverse signal for entrepreneurship. Instead, he encourages prospective entrepreneurs gain real-world experience by working at a startup and pursuing other courses of study that help form fundamental critical thinking skills.