Certain fundamentals are key to your business education beyond your MBA degree. These fundamentals include characteristics like persistence, drive and the determination to keep going in the face of adversity. For instance, Elon Musk worked several low paying jobs before finding his entrepreneurial stride. Sara Blakely got her degree in communications and sold fax machines door-to-door before founding what is now a billion-dollar company. See how these and other top business figures of both the past and present leaned on their grit and determination to find success.