Billionaire founder Sara Blakely's best business advice

SPANX inventor Sara Blakely believes that anyone starting a business should ask themselves one important question.

Business Tips From the Person Who Reinvented the Girdle

Spanx Founder Sara Blakely Reflects on Her 'Unusual' Business

How Spanx's Sara Blakely made a billion

Sara Blakely on Celebrating Failure & Creating Spanx

Spanx's Sara Blakely Shares 5 Tips for Building a Billion-Dollar

6 Keys to Sara Blakely's Success - Thrive Global

Billionaire entrepreneurs share one 'underrated quality

Top Five Startup Tips From Spanx Billionaire Sara Blakely