Barbara Corcoran is known as a bubbly firebrand who isn't afraid to speak her mind, especially on Shark Tank.

But you don't need to be as extroverted as Corcoran to be successful in business. In fact, in a new one Instagram post on TuesdayCorcoran said every successful business needs an introvert and an extrovert to make decisions.

Connected: Barbara Corcoran on NAR Settlement: “It's a Scary Time for Real Estate Agents”

of Real Estate Maven says her founding business partner at the Corcoran Group, Esther Kaplan, was an “extreme introvert” and explained how she divided business delegations based on whose strengths played best in different roles.

“I did all the categories, recruiting, sales, marketing, everything that a big extrovert does naturally well,” Corcoran explained. “And she did the audit, the systems, the banking, the legal, everything that I couldn't do. And together, we were a fabulous team.”

Corcoran called the combination of extrovert and introvert in leadership an “unbeatable combination.”

“Shark Tank” star. spoke last September about her decision to employs Kaplan in 1973 in an Instagram video, when she admitted she almost didn't bring it at first because she was too soft-spoken — until she looked inside her purse and saw how organized it was.

Connected: Barbara Corcoran asks these 3 questions before hiring someone new

“She had the smallest filing system I've ever seen, with compartments that were all labeled inside her bag. With that in mind, I knew I wanted my business in her bag.” Corcoran said. “I opened a position for her on the spot and told her I couldn't wait to take her under my wing and teach her everything she needed to know to sell.”

The pair ran the Corcoran Group together until Pamela Liebman took over from Kaplan and Corcoran as President and CEO of the company in 2000.